Marcel P.T. Chin-A-Lien · GLIAG · Zoetermeer (The Netherlands) & Paramaribo (Suriname) · ORCID iD 0009-0007-1649-602X
A return to D.J. Beets and H.J. Mac Gillavry’s 1977 outline of the Cretaceous and Early Tertiary history of the ABC islands, joined to a childhood at Welgelegen and the hill of Fort Waakzaamheid.
Before the island became a stratigraphic column, it was a place to grow up.
Welgelegen, Seroe Domi and the coast belong first to family life: a house, a bedroom window, open ground, brothers and friends. Geology arrived as a question. Why should rock containing the remains of a reef stand above the sea in which reefs live? And why should that pale limestone rest so directly upon the dark volcanic rock beneath it?
A fossil coral is evidence of a former organism and environment; its present position is the outcome of everything that happened afterwards. Deposition, exposure, dissolution, deformation, erosion and changing sea level must be disentangled. The landscape offers the problem. It does not supply its own unambiguous explanation.
The Earth Remembers is a metaphor, not a claim that rocks remember as people do. People remember selectively. Rocks preserve selectively. Between those two incomplete archives, this essay seeks a disciplined conversation: the affection that makes us return to a place, and the evidence that may require us to change our account of it.
Curaçao, Bonaire and Aruba preserve related but non-interchangeable records of the southern Caribbean plate boundary. Revisiting Beets and Mac Gillavry’s 1977 synthesis, this essay considers volcanic basement, arc-related intrusions, sedimentary successions, carbonate diagenesis and reef terraces alongside personal recollections of Curaçao.
Its governing argument is methodological: island-specific observations must precede regional reconstruction. Curaçao and Aruba preserve mafic volcanic complexes commonly associated with the Caribbean–Colombian oceanic plateau, whereas Bonaire preserves a heterogeneous Cretaceous volcanic, volcaniclastic and sedimentary record divided into structural and stratigraphic domains.
Subsequent exhumation, basin development, faulting and carbonate deposition further distinguish the islands. The Seroe Domi Formation records changing depositional environments, from a deep-water carbonate slope at its base to shallower fore-reef settings above, followed by exposure and repeated diagenesis. Raised coral limestone constrains relative sea-level history rather than uplift alone. Exposed island rocks provide offshore analogues rather than proof of petroleum charge.
A memoir thread runs through the science. Near the family house at Welgelegen, basal Seroe Domi limestone rests on diabase basement in the first bend of the Gouverneur van Lansbergenweg: an unconformity the author passed almost daily as a boy, read here alongside James Hutton’s Siccar Point, and next to it Fort Waakzaamheid, the hill of play, kites and sunsets. The essay separates personal testimony, direct observation, regional interpretation and subsurface prediction, and identifies priorities for further research.
Keywords: Curaçao; Bonaire; Aruba; Leeward Antilles; Caribbean Large Igneous Province; Seroe Domi Formation; Soebi Blanco Formation; unconformity; nonconformity; James Hutton; Fort Waakzaamheid; carbonate diagenesis; geological memoir.
On 31 May 1977 I graduated in geology at Leiden University. As the fiftieth anniversary approaches, I return to Curaçao, the island where I was born and grew up, with geological questions that began in childhood.
This essay is both a scientific reconsideration and part of my memoir, The Earth Remembers. It is dedicated to Curaçao, to my parents and eldest brother, whose memory is tied to R.K. Begrafenis, Roodeweg, Santa Ana Katoliko, and to the landscapes that first taught me to observe.
Unda mi lombrishi ta dera: where my navel string is buried.
Our house at Welgelegen, on the Mgr. Kieckensweg, is still our family house. I have returned almost every year since my youth. It is not a place I know only through recollection, but one whose changes I have continued to witness: a family home within a landscape that has remained part of my life.
Close by, about fifty metres from the house, in the first gentle bend of the Gouverneur van Lansbergenweg, lies the contact that attracted my attention long before I understood its full significance. There, the younger basal limestone of the Seroe Domi Formation rests upon the dark diabase basement. The pole carrying the street name provides an ordinary landmark for an extraordinary geological boundary.
I passed that spot almost daily.
Even as a boy, I recognised that something unusual was before me: younger limestone resting directly upon much older volcanic rock. I could distinguish the two. I could see the superposition. What I did not yet understand was the history concealed within the meeting of those rocks.
I had noticed the relationship before I knew its name.
Only later would I learn to recognise it as an unconformity; more specifically, where sedimentary cover rests on an eroded igneous basement, a nonconformity. The important thing was not merely that one rock lay above another. It was that the preserved succession omitted an immense interval between them.
Taking the basement as approximately 88 million years old and the basal carbonate as Middle Miocene, roughly 16 to 12 million years old, the age separation would be on the order of 72–76 million years: roughly seventy-five million years (Sinton et al. 1998; Fouke et al. 1996). That is the scale suggested by the regional ages, not a precisely measured duration at this particular exposure. Establishing the local hiatus requires the age and identity of the rocks immediately on either side of the contact to be confirmed.
Nor does the missing interval mean that the place stood unchanged, exposed to the air, throughout those millions of years. Deposition, erosion, burial, deformation and renewed exposure may all contribute to a record whose intervening chapters have not survived there.
An unconformity is not a thickness of time that can simply be measured with a ruler. It is an absence in the preserved record. Rocks may never have been deposited there, or they may have formed and later been removed. The boundary remains; much of the history that produced it does not.
As a child, I crossed the boundary in a few steps. I did not know that I was passing between two surviving chapters of an immensely longer history.
The street-sign locality is my firsthand identification. Fouke’s work provides the wider stratigraphic and diagenetic framework for the Seroe Domi Formation; it is not taken here as independent confirmation of the precise position of that pole.
Much later, James Hutton’s work would give that childhood observation a wider intellectual setting.
At Siccar Point in Scotland, Hutton examined a spectacular relationship in 1788: younger, gently inclined Devonian deposits resting across the truncated edges of much older, steeply tilted Silurian beds. The older sediments had been deposited, consolidated, deformed and eroded before the younger deposits accumulated above them. The contact demanded a succession of events and a duration far beyond ordinary human experience (Hutton 1788).
Welgelegen is not a Caribbean replica of Siccar Point. The Scottish exposure is an angular unconformity between sedimentary successions; the contact I remember is limestone upon igneous basement. Their geological geometries differ.
But they invite a related act of understanding: to recognise that a visible surface may represent an enormous interval absent from the preserved record.
I would not claim that, as a boy, I had already understood what Hutton understood. I had not. I had seen something strange and begun to ask a question. The limestone above the diabase was an observation waiting for an explanation.
That distinction matters to me. Geological curiosity did not begin with terminology. It began with noticing that familiar ground contained something I could not yet account for.
In 2026, the three-hundredth anniversary of Hutton’s birth brought this intellectual connection back to Leiden, where he received his medical doctorate in 1749 and where I would graduate in geology more than two centuries later.
On Sunday 14 June, the Leidse Geologische Vereniging commemorated his tercentenary with a musical tribute by the Red Rose of Lochbuie Pipes and Drums and a wreath-laying at the plaque marking his former residence. The LGV’s account of the commemoration records the occasion.
I explored that Leiden connection in my essay “Leiden University: Birthplace of Geology’s Founders”, which brings together Niels Stensen, James Hutton and the city in which both received their medical doctorates. Here, that history meets a much more personal exposure: a bend in a road near our family house, where I had already seen younger rock resting strangely upon an older foundation without yet understanding the magnitude of the missing time.
The younger rock itself requires an equally important correction to the picture.
It is tempting to imagine that every coral-bearing limestone began as a shallow reef growing directly where we now find it. Fouke’s work shows why that would be too simple for the basal Seroe Domi Formation.
In their 1996 study, Fouke and colleagues describe the lowermost 30–100 metres as a succession of coralgal grainstone gravity-flow deposits, pelagic wackestones and transported blocks. They interpret these rocks as having accumulated during the Middle Miocene in deep-water fore-reef and carbonate-slope environments, at depths exceeding 500 metres (Fouke et al. 1996).
This is not the image of a sunlit reef flat beneath our childhood footsteps.
It is the image of a submarine slope receiving material from elsewhere: carbonate grains and fragments carried downslope by gravity-driven flows, blocks displaced from their original positions, and finer sediment accumulating between those events. Coral and algal material could originate in shallower environments and become incorporated into deposits far below the setting in which those organisms had lived. The fossil material and its final place of burial need not tell the same bathymetric story.
Applied cautiously to the Welgelegen–Seroe Domi area, this provides a different palaeogeographic starting point. Where the basal deep-water facies are present, the younger sedimentary record begins not with an established terrestrial hill or a shallow reef pavement, but with part of a submerged slope bordering a carbonate-producing marine system.
The older volcanic foundation supplied inherited relief beneath that developing sedimentary cover. The exact shape of the slope, the position of its shallower carbonate sources and the depth of the particular street-side exposure cannot be restored from the contact alone. Those details require correlation with measured sections and mapping.
The broader depositional progression is nevertheless significant. Fouke’s younger subunit, about 250 metres thick, consists of coralgal packstones with basement-derived siliciclastic sands, interpreted as recording shallowing fore-reef to reef-front environments during the Late Miocene and Pliocene. The succession therefore preserves a change from deeper slope deposition towards shallower carbonate environments, followed by further exposure and alteration. It is not one reef frozen in place through time.
All this ground was our extended playground.
Welgelegen, Seroe Domi, Fort Waakzaamheid and the land towards the coast belonged to the geography of our childhood, before the Nijlweg existed as the connection to the Koningin Juliana Bridge and divided the area as it does today.
My brothers, our friends and I explored it, played cowboys and Indians with handmade arrows, and looked for plants, animals, rocks and fossils. We knew it first through movement, familiarity and play.
At about twelve I also began asking why coral limestone lay high above the sea at Seroe Domi when I could see living corals and similar forms at beaches such as Piscadera Bay.
At the Radulphus College, in class 2, those questions found a teacher. Drs. Roozenburg taught physical geography, and his course included a short chapter on the geology of Curaçao: some ten pages, run off as a stencil, as was usual in those days. From then on, whenever I visited the Wetenschappelijke Bibliotheek in Punda, I looked for books on geology, and I did the same in the library of Carmabi at Piscadera. That year I scored a 10, the top mark, in physical geography throughout, the highest in the class. When Drs. Roozenburg described the work geologists did, as explorers and discoverers in deserts, jungles and little-known foreign countries, my choice was made. That was what I wanted to study.
We did not imagine the submarine slope beneath the history of our playground. We did not picture sediment-laden flows descending through deep water, or coral fragments travelling away from the shallower environments in which they had grown.
Those are reconstructions available to me now, through geological study. They must not be placed retrospectively in the mind of the child I was.
But the child had already noticed the essential disturbance in the familiar scene: young limestone upon old diabase. Something had happened there. More than one something. The rocks did not belong to a single moment.
Our family explored the island on weekends and during holidays. We learned its landscapes by walking and travelling through them. From our bedroom window, Seroe Domi brought to mind Mont Sainte-Victoire, repeatedly painted by Paul Cézanne. That is a visual and personal analogy, not a geological one. The hill became my first field area before I had the language to describe it.
My family’s migration story, as transmitted within the family, begins in Guangdong, near Malik town in the present-day Shenzhen area, and reaches Curaçao around 1875. That account merits archival research. It is distinct from the tectonic movement of Caribbean crustal blocks. The connection is not mechanistic but human: places and identities have histories, and geology preserves one of them.
Because I have returned almost every year, this landscape has never become a place sealed inside my childhood. I have continued to see it as roads, buildings and access have changed around the ground I knew. Our family house remains part of that continuing relationship. So does the first gentle bend.
Hutton’s lesson helps me read it more carefully now: the Earth’s history resides not only in the rocks that remain, but also in the surfaces that separate them.
The street-name pole identifies a place in our neighbourhood.
The unconformity opens that place onto deep time.
Our playground had more than one kind of history beneath it.
Near the family house on the Mgr. Kieckensweg, younger limestone rested upon ancient diabase at the bend in the road. A little farther on stood Fort Waakzaamheid. Between the contact, the hill and the fort, we moved through a landscape whose different ages had not yet arranged themselves into separate subjects in our minds. There was no geological childhood here and a historical childhood somewhere else. There was simply the place where we lived.
My four brothers and I played throughout this ground, before the Nijlweg and its connection to the Koningin Juliana Bridge divided the surroundings as they do today. The fort belonged to that extended territory of exploration. What soldiers had once occupied for defence, we knew as somewhere to go, to play, to fly our kites, and to look out towards the sea.
And often, towards evening, we went there for the sunsets.
Long before anyone chose this height for a defensive position, the ground had already passed through histories beyond human reckoning.
In the surrounding landscape, the dark volcanic foundation belongs to the island’s ancient oceanic beginnings. Younger Seroe Domi carbonates preserve a much later marine history: deep-water slope deposits at the base, shallower fore-reef to reef-front deposits above (Fouke et al. 1996). The land we knew as a playground was therefore the surviving outcome of deposition, alteration, erosion and changing elevation, not an ancient landscape preserved unchanged.
I remember the fort and its surroundings as belonging to this meeting of limestone and basement. The precise distribution of those rocks beneath individual walls would require detailed mapping, but the geological contrast was part of the ground we knew.
There is something quietly astonishing about a fort in such a setting. Its builders selected a useful height. Geology had supplied the height through processes they had no need to reconstruct before placing their guns.
The military eye saw a commanding position.
The geological eye sees the much longer history that made a commanding position possible.
Fort Waakzaamheid dates from 1803. A small coral-stone fortification rather than a great citadel, it formed part of the defensive landscape around Willemstad. From its position on the Seru Domi height, it overlooked Otrobanda and the approaches to the Sint Annabaai, giving its occupants the advantage of observation and artillery command (Monumentenzorg Curaçao).
Its name, Waakzaamheid, vigilance, belongs to a world in which the appearance of ships could mean more than trade or arrival. The sea connected Curaçao to other places, but it also carried the possibility of invasion.
Popular accounts tie its construction to fear of a renewed French attack. The archival narrative that P.A. Euwens printed in 1907–08 from the colony’s Council minutes tells a different story. A French expedition from Guadeloupe had besieged Otrobanda in 1800, but by May 1803 France was the ally of the Batavian Republic and Britain was the enemy. Euwens also places the fort precisely: “het fort Waakzaamheid op den berg Cortijn, aan den Rooden Weg”, on ground belonging to the plantation Welgelegen (Euwens 1907a). Our playground and the fort’s ground were, quite literally, the same land.
In February 1804 a British squadron under Captain John Bligh of HMS Theseus landed, took the hill and shelled Willemstad from it for nearly four weeks. A French platoon fought on the Dutch side. Fort Amsterdam held, and on 26 February the British withdrew (Euwens 1907b). The fort was not built merely to provide the fine prospect that later visitors would enjoy. Its view had a purpose: to watch, to anticipate and, if necessary, to fire.
The island’s defences also belonged to a colonial society. Their history cannot be separated from the unequal world they protected. Euwens’s account of 1803–1804 describes not only military arrangements but scarcity, drought and the hardship suffered by poorer inhabitants and enslaved people. Beneath the language of strategy lay the ordinary question of whether people could obtain enough to eat (Euwens 1908).
In the twentieth century, the position acquired another military role. In February 1942 a US Army anti-aircraft battery took post on the hill to cover the harbour and the refinery, and barracks and an observation post were added (Onderwater 2016; Beautiful Curaçao). A height selected for one age of warfare was adapted to another.
The weapons changed. The usefulness of being able to see remained.
The archival detail of 1803–1804 and 1942 is set out in the companion essay Vigilance on Limestone: Fort Waakzaamheid and the Defensive Ring of Willemstad (GLIAG, 2026).
By our childhood, the fort had entered another history altogether.
We played.
Five brothers could occupy the neighbourhood with ambitions considerably larger than our equipment. Our campaigns required imagination, open ground and the confidence that the afternoon would last. The major unconformity nearby had already omitted many tens of millions of years from its record; we were capable of losing an entire afternoon without accounting for it either.
There is the geological humour of the place: children conducting urgent adventures beside a boundary that made almost every human urgency look brief.
But I would not put adult knowledge into the children we were. We did not play with the thought of Cretaceous basement beneath us or Miocene sediment flows in our heads. Those understandings came later.
What was already present was attention. I had noticed the strange superposition at the bend: pale younger rock on dark older rock. Around the fort, we knew the shape and possibilities of the ground through repeated use.
We were learning a landscape before we learned to explain it.
Then there were the evenings when we went to watch the sun.
Those sunsets did something that has lasted longer than any of our childhood games. They established my idea of what a sunset is.
Since then, wherever I have travelled, some part of the comparison has already been made. The reference is there: the view from near Fort Waakzaamheid, the Caribbean before us, the closing light over the place that was home.
I do not need to claim that no other island possesses such beauty. That would turn a personal truth into a competition it does not require.
For me, those sunsets were unique. They were the best I have ever seen on this globe.
They became the measure.
A fort designed to scrutinise the horizon became, in our lives, a place from which to admire it. Where an earlier watcher might have searched for a threat, we waited for the light.
The same horizon can hold fear in one century and belonging in another.
I have been back almost every year. The house remains our family house, and this landscape has never become merely the setting of a childhood I left behind.
Each return brings its own comparison: what has changed, what remains recognisable, what I now understand differently.
The unconformity gives the place one order of time. The fort gives it another. Our childhood supplies a third: not a geological layer in any literal sense, but a human history attached to the same ground.
Ancient volcanic rock. Younger marine deposits. Erosion and relief. A defensive position. Five brothers at play. Our kites in the air. An evening sky.
These histories do not explain one another, yet here they meet.
At the bend in the road, I learned eventually to recognise time that was missing.
Near the fort, watching the sunset, I learned something else: how a brief moment can remain present for the rest of a life.
The fort was named for vigilance.
We, too, learned to watch.
The point of departure is Beets and Mac Gillavry’s “Outline of the Cretaceous and Early Tertiary History of Curaçao, Bonaire and Aruba,” published in the Eighth Caribbean Geological Conference field-excursion guide, GUA Papers of Geology, volume 10, pages 1–6.
That guide contains separate island chapters and field excursions as well as the regional outline. Those contributions must remain distinct; this essay does not replace them or claim to reproduce their full contents.
The scientific approach combines published mapping, stratigraphy, fossil and radiometric age constraints, geochemistry, structural analysis, thermochronology, carbonate sedimentology, diagenesis, offshore geophysics and plate reconstruction.
These methods answer different questions. An isotope age may constrain crystallisation or cooling; fossils constrain deposition within the limits of preservation and reworking; geochemistry helps investigate magma sources and processes; structures establish relative sequences of deformation.
A regional explanation becomes stronger when independent observations converge. It becomes weaker when one kind of evidence is made to answer every question.
“Early Tertiary,” used in the 1977 title, is now generally replaced by Paleogene terminology. Ages are expressed in Ma, millions of years before present.
Precision must not be confused with certainty where alteration, limited exposure or incomplete fossil control restricts interpretation. The present synthesis includes targeted source checks, not a claim to exhaustive coverage of all literature published by 4 November 2026.
Curaçao, Bonaire and Aruba lie north of Venezuela within the broad boundary zone between the Caribbean and South American plates. They form part of the Leeward Antilles, but they are not a single continuous stratigraphic column.
Their present proximity reflects a history of transport, faulting and assembly of crustal blocks. Regional maps and geophysical studies emphasise adjacent basins, ridges and deformed zones; later seismic, geodetic and onshore investigations reveal a more segmented system than the geometry of an island chain alone suggests (Silver et al. 1975; Gorney et al. 2007; Hippolyte and Mann 2011).
Plate reconstructions differ in subduction timing and polarity, the origin and movement of Caribbean crust, and the geometry of interaction with northern South America (Pindell and Kennan 2009).
Shared elements include Cretaceous oceanic-plateau crust, arc-related magmatism, later continental-margin interaction and Cenozoic strike-slip deformation. These elements do not establish one uniquely demonstrated reconstruction.
Present-day Caribbean–South America relative motion is commonly estimated at roughly 18–20 mm per year eastward, with deformation distributed among faults and blocks (Weber et al. 2001).
This is not a measured long-term “migration rate of Curaçao.” A velocity requires a specified reference frame and plate pair. Geological displacement over tens of millions of years cannot responsibly be calculated by multiplying today’s GPS rate across the entire interval.
The principal conceptual shift since 1977 concerns the interpretation of the volcanic rocks.
Beets and Mac Gillavry contrasted basalt-dominated successions on Curaçao and Aruba with the compositionally more varied rocks of Bonaire. Modern work reinforces those differences while showing why no single tectonic label should automatically be assigned to every rock on one island.
The Curaçao Lava Formation comprises thick submarine mafic volcanic successions, including pillow lavas, breccias, dikes and associated intrusive bodies. It has commonly been interpreted as part of the Caribbean–Colombian oceanic plateau.
Sinton et al. (1998) reported an argon-isotope age near 89 Ma. Loewen et al. (2013) argued for a prolonged volcanic history rather than one short event.
The formation’s name should therefore not be treated as a guarantee of one age. Its volcanic and intrusive components require separate evaluation. Nor does a regional age automatically date the diabase exposed beside a particular street.
Aruba preserves mafic volcanic rocks intruded by the heterogeneous tonalitic Aruba Batholith and related dikes. Published dating places important batholith construction broadly around 90–86 Ma (van der Lelij et al. 2010; Wright and Wyld 2011).
Magma source, tectonic environment and emplacement history are related but distinct questions. Plateau-associated crust can subsequently experience subduction-related magmatism. “Plume” and “arc” need not be mutually exclusive descriptions of different components or stages within an evolving complex.
Bonaire’s classic Washikemba succession includes volcaniclastics, lavas and intermediate to felsic intrusions. Its geochemistry has been interpreted as arc-related, and the rocks record alteration, low-grade metamorphism and deformation.
Later mapping distinguishes fault-bounded packages described as the Washikemba and Matijs groups. Volcanic–volcaniclastic and sediment-dominated domains must be distinguished rather than gathered indiscriminately under one older formation name (Thompson et al. 2004; Wright and Wyld 2011).
Together, the islands preserve a heterogeneous regional history involving plateau construction, subduction-related magmatism, sedimentary basins and later juxtaposition.
Island-specific observations must come before a regional narrative.
An unconformity records an interruption in the preserved succession through non-deposition, erosion, deformation or combinations of these processes. Its duration and significance must be established locally.
On Curaçao, the Lava Formation, Knip Group and Midden-Curaçao Formation preserve a complex volcanic–sedimentary and structural history. They should not be reduced to one uninterrupted island-wide stack.
The Knip succession includes siliceous and carbonate-bearing marine sediments, turbidites and slump-related deposits. The Midden-Curaçao succession includes Paleocene clastic and volcaniclastic material. Local younger limestones record further marine deposition after intervening gaps (Beets 1972; Wright and Wyld 2011).
On Bonaire, the unconformable relationship of younger Rincon carbonates to volcanic rocks illustrates how contact relationships and fossils can overturn assumed continuity.
The Soebi Blanco Formation provides a different archive: fluvial and conglomeratic sediments derived from exposed source regions.
Zapata et al. (2014) interpret the Soebi Blanco succession as middle to upper Eocene. Its continental detritus constrains possible sedimentary connections with northern South America before later displacement. Provenance does not by itself uniquely determine a crustal block’s subsequent transport vector.
Aruba preserves a more discontinuous sedimentary record, including limited Paleogene outliers, reported early Miocene borehole sediments and younger carbonates.
Absence at outcrop is not proof of non-deposition: erosion and burial may remove or conceal earlier deposits.
At Welgelegen, the limestone–diabase contact gives these abstractions a place. Its importance is not diminished because the local hiatus is not yet dated precisely. The visible relationship itself asks us to distinguish what remains from what is missing.
The Seroe Domi Formation is central to the younger geological history of the ABC islands, although facies, thickness, age expression and relationships to older rocks vary by locality.
Fouke et al. (1996) integrated lithofacies, biostratigraphy and strontium-isotope stratigraphy on Curaçao. Their interpretation distinguishes lower Middle Miocene deposits, including deeper-water fore-reef and carbonate-slope material, from younger coralgal deposits associated with shallower fore-reef to reef-front environments.
Depositional episodes, exposure and alteration make the formation a composite record, not a single uninterrupted reef.
This distinction matters. Fossil coral within a deposit does not prove that the deposit accumulated as a shallow reef framework at its present location. Coral fragments and blocks can be transported downslope. Fossils, sedimentary fabrics and depositional geometry must be interpreted together.
Where the formation rests directly on volcanic basement, the contact records a major break. Within the carbonate succession, additional surfaces record further interruptions. Reef framework, debris, gravity flows, siliciclastic input and later cementation produce substantial lateral variation.
Dolomitization adds another history.
Fouke and colleagues distinguished multiple dolomite generations and related them to fluid chemistry, exposure and water–rock interaction. Later interpretations of island carbonates also consider spatially variable fluid pathways and reflux.
A mechanism must be demonstrated for the particular body and alteration episode, not selected merely because it is familiar.
Present mineralogy and pore structure may therefore differ substantially from those established during deposition. The formation is both a sedimentary archive and a record of later fluids moving through rock.
Similar carbonate units on Bonaire and Aruba do not imply identical architecture or alteration. Correlation requires age control and facies relationships, not resemblance alone.
Quaternary reefs, coastal deposits, dunes, alluvium and erosional surfaces record changing sea level and island elevation.
Glacial–interglacial cycles influenced reef growth; tectonic motion, waves, inherited relief and dissolution influenced preservation.
Raised coral limestone does not by itself demonstrate one uplift event. Interpretation requires the deposit’s age, its original ecological and depositional depth, whether organisms remain in growth position, the reliability of dating, past sea level and the structural history of the relevant block.
The visible coast is a filtered archive: construction, exposure, erosion, dissolution and later modification.
Herweijer, de Buisonjé and Zonneveld’s treatment of geomorphology alongside stratigraphy remains important because the rock succession alone cannot explain the shape of the land.
My childhood questions thus connect two different kinds of missing information.
The limestone above the diabase asks what happened between the formation of the older rock and deposition of the younger.
The coral above the sea asks what happened between its marine life or deposition and its present position.
One boundary does not answer both questions.
These histories also matter now. Carbonate aquifers, saline intrusion and groundwater vulnerability depend on rock architecture, fractures and alteration. Geological understanding connects the ancient marine archive with present-day communities and water systems (Kruijssen et al. 2024).
Cretaceous construction. Plateau-associated and subduction-related magmatism produced volcanic crust, volcaniclastic successions and intrusive bodies. Curaçao, Aruba and Bonaire preserve different components. Overlapping ages do not establish one common stratigraphic unit.
Late Cretaceous–Paleocene reorganisation. Sedimentation, erosion, tilting and deformation followed or accompanied magmatism. Curaçao’s marine successions and Paleocene deposits record changing basin conditions. Bonaire’s carbonate contacts require separation from its older volcanic record. Aruba retains a more limited sedimentary archive.
Eocene–Oligocene connections and exhumation. The Eocene interpretation of Soebi Blanco belongs here. Its continental detritus constrains former sediment connections. Thermochronology differentiates cooling and exhumation histories, while offshore studies identify extension and later inversion in the regional basin system (Gorney et al. 2007; van der Lelij et al. 2010).
Late Oligocene–Early Miocene basin development. Regional models invoke dextral transtension, subsidence and fault-controlled accommodation. Each island block requires local structural and chronological testing rather than automatic assignment to one regional motion history.
Middle Miocene–Pliocene carbonate accumulation. Marine inundation and carbonate deposition expanded across parts of the islands. Seroe Domi preserves successive depositional and alteration episodes above older, topographically varied substrate, beginning on Curaçao with deep-water slope deposits.
Late Neogene–Recent modification. Transpression, inversion and block movement modified earlier structures. Quaternary sea-level cycles contributed to reef terraces and coastal deposits. Modern deformation remains distributed across the southern Caribbean boundary zone.
The islands provide surface analogues and tectonostratigraphic context for the southern Caribbean offshore.
They do not establish a working offshore petroleum system.
Basement architecture, sediment pathways and deformation timing are important, but they cannot substitute for evidence of effective source rock, maturity, migration, reservoir, seal and trap timing.
Offshore assessment requires seismic interpretation, wells, geochemistry, burial-history reconstruction and petroleum-system modelling.
Potential reservoir analogues include altered or fractured volcanic rocks, sandstones, conglomerates and carbonate bodies. Their properties must be measured.
Seroe Domi helps investigate carbonate facies, dolomitization, fractures and dissolution; its exposed and altered state is not automatically representative of a buried offshore reservoir.
A responsible assessment distinguishes direct observation, regional interpretation and subsurface prediction.
Confidence should not increase merely because a statement moves from a field notebook into a regional map or investor presentation.
This essay is a geological synthesis, not a prospect evaluation, resource estimate or reserve certification.
Nearly fifty years after the 1977 synthesis, the regional answer is more detailed and less uniform.
Volcanic chronology, sedimentary contacts, provenance, thermochronology and carbonate diagenesis each complicate the idea of one simple island-chain history.
The strongest account is a segmented plate-boundary evolution in which volcanic provinces, arcs, basins and the continental margin interacted through time.
Competing reconstructions remain useful because they expose observations that still require explanation.
Priority work includes:
These would make the next synthesis more reproducible.
The Welgelegen contact offers a particularly meaningful local task: document the exposure in the first bend of the Gouverneur van Lansbergenweg, tie it to published mapping and measured sections, establish the identity of the adjacent units, and determine how tightly their ages, and therefore the missing time, can be constrained.
This would turn a precisely remembered place into a reproducible geological locality without confusing personal testimony with a completed survey.
I began with rocks that seemed strangely superposed and coral that seemed unexpectedly high above the water.
The scientific answer is not a single cause. The landscape is more complex than the first map could show.
That complexity is why it deserves renewed attention.
The child’s question survives the adult’s vocabulary.
The coral is still above the water. The pale rock still meets the dark rock. Our family house is still a place to which I return.
What changes is the care with which an answer can be given. There is no need to make the island simpler in order to love it, or to make uncertainty disappear in order to understand it.
The fiftieth anniversary of my Leiden graduation falls on 31 May 2027. That interval is a human measure, not a geological one. Yet it is long enough for maps to change, analytical methods to sharpen, and confident regional narratives to divide into more faithful local histories.
To return to Welgelegen is not to recover an unchanged childhood. It is to revisit a living family place with questions that have grown more exact.
The pole names a street. The rocks beneath it open onto an interval that a street name cannot contain.
Family memory explains why this place matters to me. Geology tests what can responsibly be said about its past.
Neither needs to impersonate the other.
The island need not surrender its mystery to become intelligible.
It asks for something harder and more enduring: attention.
The autobiographical passages draw on the author’s recollections, including his identification of the contact in the first bend of the Gouverneur van Lansbergenweg, about fifty metres from the family house. That location is not presented as a newly surveyed or independently dated site. Family migration history remains a family account pending archival corroboration.
The 1977 source volume contains separate contributions by several authors. This essay updates a regional outline and does not replace those works. Figures 1–3B come from the author’s source manuscript; their conceptual geometry and inherited labels are not independently validated field measurements or a uniquely demonstrated reconstruction. The frontispiece and Plate 1 are conceptual artworks created for the author.
Perplexity Computer, an AI agent system, assisted with editorial restructuring, source and reference checks, literary drafting and document preparation under the author’s direction. It is not an author. The author checked the text, accepts the interpretations and takes responsibility for every statement. The frontispiece and Plate 1 were produced with AI image generation from the author’s brief. No independent peer review is implied. No confidential data were used.
Scientific literature
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Beets, D.J. (1972). Lithology and stratigraphy of the Cretaceous and Danian succession of Curaçao. Uitgaven Natuurwetenschappelijke Studiekring voor Suriname en de Nederlandse Antillen 70. Kemink, Utrecht.
Beets, D.J. and Mac Gillavry, H.J. (1977). Outline of the Cretaceous and Early Tertiary history of Curaçao, Bonaire and Aruba. In: Eighth Caribbean Geological Conference, Guide to the Field Excursions on Curaçao, Bonaire and Aruba. GUA Papers of Geology 10, 1–6. Stichting GUA, Amsterdam.
Beets, D.J., Mac Gillavry, H.J. and Klaver, G. (1977). Cretaceous and Early Tertiary of Bonaire. GUA Papers of Geology 10, 18–28.
DINOloket / TNO–Geological Survey of the Netherlands (2023). Geological Map of the Kingdom of the Netherlands, Caribbean islands component and explanatory materials.
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Gorney, D., Escalona, A., Mann, P., Magnani, M.B. et al. (2007). Chronology of Cenozoic tectonic events in western Venezuela and the Leeward Antilles based on integration of offshore seismic reflection data and on-land geology. AAPG Bulletin 91(5), 653–684. https://doi.org/10.1306/11280606002
Helmers, H. and Beets, D.J. (1977). Cretaceous of Aruba. GUA Papers of Geology 10, 29–35.
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Hutton, J. (1788). Theory of the Earth; or an investigation of the laws observable in the composition, dissolution, and restoration of land upon the globe. Transactions of the Royal Society of Edinburgh 1, 209–304. https://doi.org/10.1017/S0080456800029227
Kruijssen, T.P., Wit, M.R.J., van Breukelen, B.M., van der Ploeg, M. and Bense, V.F. (2024). Hydrogeological conceptualization of a small island groundwater system using historical data. Netherlands Journal of Geosciences 103, e27. https://doi.org/10.1017/njg.2024.21
Loewen, M.W., Duncan, R.A., Kent, A.J.R. and Krawl, K. (2013). Prolonged plume volcanism in the Caribbean Large Igneous Province: new insights from Curaçao and Haiti. Geochemistry, Geophysics, Geosystems 14, 4241–4259. https://doi.org/10.1002/ggge.20273
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Thompson, P.M.E., Kempton, P.D., White, R.V., Saunders, A.D., Kerr, A.C., Tarney, J. and Pringle, M.S. (2004). Elemental, Hf–Nd isotopic and geochronological constraints on an island arc sequence associated with the Cretaceous Caribbean plateau: Bonaire, Dutch Antilles. Lithos 74, 91–116. https://doi.org/10.1016/j.lithos.2004.01.004
van der Lelij, R., Spikings, R.A., Kerr, A.C., Kounov, A., Cosca, M., Chew, D. and Villagómez, D. (2010). Thermochronology and tectonics of the Leeward Antilles: evolution of the southern Caribbean Plate boundary zone. Tectonics 29, TC6003. https://doi.org/10.1029/2009TC002654
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History of Fort Waakzaamheid
Euwens, P.A. (1907a). Curaçao in 1803–1804. I. Onze Eeuw 7. DBNL. https://www.dbnl.org/tekst/_onz001190701_01/_onz001190701_01_0066.php
Euwens, P.A. (1907b). Curaçao in 1803–1804. II. Het beleg van Curaçao in Februari 1804. Onze Eeuw 7. DBNL. https://www.dbnl.org/tekst/_onz001190701_01/_onz001190701_01_0073.php
Euwens, P.A. (1908). Curaçao in 1803–1804. III. Onze Eeuw 8. DBNL. https://www.dbnl.org/tekst/_onz001190801_01/_onz001190801_01_0010.php
Monumentenzorg Curaçao. Fort Waakzaamheid. https://monumentenzorg.cw/properties/fort-waakzaamheid/
Onderwater, T.A. (2016). ‘Onder bescherming der Amerikaansche vloot’: Curaçao tijdens de Tweede Wereldoorlog. Marineblad 126(8). https://marineblad.nl/images/Marineblad/2010-2019/2016/Nr._8/MB_december_20161512.pdf
Beautiful Curaçao. Fort Waakzaamheid. https://www.beautiful-curacao.nl/bezienswaardigheden/fort-waakzaamheid.php
Hutton tercentenary
Leidse Geologische Vereniging (2026). LGV viert de 300ste geboortedag van James Hutton in Leiden. https://www.lgvweb.nl/lgv-viert-de-300ste-geboortedag-van-james-hutton-in-leiden/
Related publications by the author
Chin-A-Lien, M.P.T. (2026). Curaçao: An Island Born of Fire and Perseverance. Petroleum & Energy Insights, 13 June 2026. https://petroleumenergyinsights.com/curacao-an-island-born-of-fire-and-perseverance/
Chin-A-Lien, M.P.T. (2026). Leiden University: Birthplace of Geology’s Founders. Petroleum & Energy Insights, 25 August 2026. https://petroleumenergyinsights.com/leiden-university-birthplace-of-geologys-founders/
Chin-A-Lien, M.P.T. (2026). Curaçao–Aruba Seismic Design: A Petroleum Exploration Guide. Petroleum & Energy Insights, 29 July 2026. https://petroleumenergyinsights.com/curacao-aruba-seismic-design-a-petroleum-exploration-guide/
Chin-A-Lien, M.P.T. (2026). Bonaire Basin: Unveiling Petroleum Potential. Petroleum & Energy Insights, 31 July 2026. https://petroleumenergyinsights.com/bonaire-basin-unveiling-petroleum-potential/
Chin-A-Lien, M.P.T. (2026). Bonaire Basin Petroleum Analysis: Recoverable Resources. Petroleum & Energy Insights, 1 August 2026. https://petroleumenergyinsights.com/bonaire-basin-petroleum-analysis-recoverable-resources/
Chin-A-Lien, M.P.T. (2026). Exploring Colombia’s recent Gas Discoveries: Comparison with Bonaire Basin: Gas System Insights. Petroleum & Energy Insights, 3 August 2026. https://petroleumenergyinsights.com/exploring-colombias-bonaire-basin-gas-system-insights/
Chin-A-Lien, M.P.T. (2026). Exploring the Carbonate Paleohigh Corridor in the Southern Caribbean. Petroleum & Energy Insights, 4 August 2026. https://petroleumenergyinsights.com/exploring-the-carbonate-paleohigh-corridor-in-the-southern-caribbean/
Chin-A-Lien, M.P.T. (2026). Dushi Korsou: Alonso de Ojeda, 1499, and the Island of the Giants. Petroleum & Energy Insights, 21 October 2026. https://petroleumenergyinsights.com/dushi-korsou-alonso-de-ojeda-1499-and-the-island-of-the-giants/
Chin-A-Lien, M.P.T. (2026). Vigilance on Limestone: Fort Waakzaamheid and the Defensive Ring of Willemstad. GLIAG-CUR-HIS-1803-2026-001. GLIAG, forthcoming on Zenodo.
Drs. Marcel P.T. Chin-A-Lien, MBA, M.Sc., Ing., geologist, graduated in geology at Leiden University on 31 May 1977. He is Principal Founder and Chief Architect of GLIAG, an AAPG Certified Petroleum Geologist (#5201-1996), an EFG European Geologist (#92-1996) and an AIEN energy negotiator. He grew up at Welgelegen, below Fort Waakzaamheid, and works from Zoetermeer and Paramaribo. The Earth Remembers is his memoir in progress.
The author is the founder of GLIAG. No funding was received for this work, and no other competing interests are declared.
© 2026 Marcel P.T. Chin-A-Lien. Released under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International licence (CC BY-NC-ND 4.0), https://creativecommons.org/licenses/by-nc-nd/4.0/. Figures 1–3B, the frontispiece and Plate 1 are the author’s material and are included under the same licence. Third parties keep their rights in the publications cited.
Cite as: Chin-A-Lien, M.P.T. (2026). The Earth Remembers. Coral Above the Sea. Curaçao, Bonaire and Aruba: Cretaceous Foundations, Moving Boundaries and the Landscapes of Belonging. GLIAG-CUR-GEO-1977-2026-001, Revision 1.0, 4 November 2026. GLIAG. Zenodo. DOI: 10.5281/zenodo.23962866
Text and data mining. The author expressly reserves the rights of reproduction and extraction of this work for text and data mining, including the training of artificial-intelligence systems, under Article 4(3) of Directive (EU) 2019/790.
Correspondence: info@gliag.com.
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