A state is not a point, and this page stands on one: a box around New York City. It is the only anchor in the state with anything in it — Albany, Buffalo, Ithaca and the state's own middle each return nothing at all in this window: the rock up there is older than the whole page. Inside this box are 2,116 fossils, and they do not agree: 901 are recorded as living on land, 809 in the sea, 264 as both, and 142 with nothing recorded at all. No other place on this site is so evenly split. 3 of the five ages have a witness; the rest are blank and stay blank.
Five ages in the past of this place, each one a window rather than a day. Each says which witness spoke — and where our evidence cannot answer yet, it says that too.
“Ma” means millions of years ago. The dashed mark means our sources have nothing for that age — which is a finding, not a fault.
Four piles, and no winner
Most places on this site lean heavily one way. This one does not, and the temptation it creates is worth naming before you look at the numbers: you are about to want to know which pile is biggest.
On land
901
the database records these as living out of the water
In the sea
809
and these as living in it
Both
264
returned under both headings, their recorded home being the edge between
Not recorded
142
found, catalogued, and never asked
The biggest pile does not win, and this page will not pretend otherwise. These four numbers are not four measurements of one question. Whether a fossil is found at all depends on the rock reaching the surface, on somebody digging there, and on somebody writing it down — and none of those is evenly spread between the sea and the land.
So the honest reading is the shape rather than the ranking: near this city, over the span this page covers, both kinds of world are recorded, in numbers close enough that any story preferring one of them is being told by the person telling it.
Travel back in time
Three of these five rows have something to say and two have nothing. Where a row is empty it stays empty — the evidence at one age is not allowed to speak for its neighbours.
250
million years agojump to the evidence250 million years ago, the plate model puts this ground almost on the equator. This is one of the ages the models argue about most: published reconstructions put it as much as 6.3° of latitude apart, which is several hundred kilometres. Treat it as one model's answer, not a photograph.
200
million years agojump to the evidence200 million years ago, the plate model puts this ground almost on the equator. Published models disagree by about 3.8° of latitude here — a few hundred kilometres — so it is one model's answer, not a photograph.
150
million years agojump to the evidence150 million years ago, the plate model puts this ground about 15° north of the equator. Published models disagree by about 4.9° of latitude here — a few hundred kilometres — so it is one model's answer, not a photograph.
100
million years agojump to the evidence100 million years ago, the plate model puts this ground about 29° north of the equator. This is one of the ages the models argue about most: published reconstructions put it as much as 5° of latitude apart, which is several hundred kilometres. Treat it as one model's answer, not a photograph.
66
million years agojump to the evidence66 million years ago, the plate model puts this ground about 38° north of the equator. Published models disagree by about 3° of latitude here — a few hundred kilometres — so it is one model's answer, not a photograph.
What was the water doing?
Five ages, oldest first. Each one has two kinds of witness — the rock of the wider region, and the fossils dug up near the city — and they are kept apart on purpose, because they are answers to different questions.
Each age here is a marker on the timeline, not a single day. The evidence that belongs to it comes with an age range of its own that overlaps the marker — so it can tell you what this stretch of time was like, and never what was happening on one exact date.
Our evidence has no witness here
Around 250 million years ago
250 million years ago, the plate model puts this ground almost on the equator. This is one of the ages the models argue about most: published reconstructions put it as much as 6.3° of latitude apart, which is several hundred kilometres. Treat it as one model's answer, not a photograph.
An open question
Neither of the evidence sources we use can answer this one: our regional rock record holds no unit for 250 million years ago at this point, and no fossil dug up nearby covers that age either. That is a real gap in the evidence, not a gap in the past — and saying so is more useful than guessing.
The rock of the region says land
Around 200 million years ago
200 million years ago, the plate model puts this ground almost on the equator. Published models disagree by about 3.8° of latitude here — a few hundred kilometres — so it is one model's answer, not a photograph.
The rock of the region
Across the wider region, the rock from 200 million years ago — the Newark Gp — was laid down on land, not under the sea. That is a statement about roughly 4,600 square kilometres of region, centred about 37 km from the city — not about the ground under one street.
The fossils dug up nearby
31 fossils dug up near New York City have an age range covering 200 million years ago: 0 from the sea, 31 from land. The closest of them was found about 25 km away — near the city, never under it.
Our evidence has no witness here
Around 150 million years ago
150 million years ago, the plate model puts this ground about 15° north of the equator. Published models disagree by about 4.9° of latitude here — a few hundred kilometres — so it is one model's answer, not a photograph.
An open question
Neither of the evidence sources we use can answer this one: our regional rock record holds no unit for 150 million years ago at this point, and no fossil dug up nearby covers that age either. That is a real gap in the evidence, not a gap in the past — and saying so is more useful than guessing.
Only the fossils speak
Around 100 million years ago
100 million years ago, the plate model puts this ground about 29° north of the equator. This is one of the ages the models argue about most: published reconstructions put it as much as 5° of latitude apart, which is several hundred kilometres. Treat it as one model's answer, not a photograph.
The rock of the region
No rock layer from 100 million years ago survives in the regional record here, so the rock has nothing to say about this age.
The fossils dug up nearby
131 fossils dug up near New York City have an age range covering 100 million years ago: 75 from the sea, 56 from land. The closest of them was found about 29 km away — near the city, never under it.
The rock of the region says sea
Around 66 million years ago
66 million years ago, the plate model puts this ground about 38° north of the equator. Published models disagree by about 3° of latitude here — a few hundred kilometres — so it is one model's answer, not a photograph.
The rock of the region
Across the wider region, the rock from 66 million years ago — the Hornerstown Fm — was laid down in the sea. That is a statement about roughly 4,600 square kilometres of region, centred about 37 km from the city — not about the ground under one street.
The fossils dug up nearby
702 fossils dug up near New York City have an age range covering 66 million years ago: 515 from the sea, 45 from land, 142 that nobody has classified. The closest of them was found about 18 km away — near the city, never under it.
The regional column spanning 66 Ma is marine; the fossils dug up near this place whose age range contains 66 Ma are 515 marine, 45 terrestrial and 142 unclassified. These are different claims about different things — a region tens of thousands of km² wide, and individual digs kilometres away — and both are shown. The nearby fossil record is mixed — it holds both sea animals and land animals whose age ranges overlap this age.
What was dug up nearby?
Each of these was dug up somewhere around the city and never beneath it, so the distance to the dig is on every row. The environment column is the database talking, and on this page it disagrees with itself more than anywhere else on the site.
Around 66 million years ago
A Raninella from around this time (its own age range is 72.2–83.6 million years) was dug up about 3.1 km from here, in the Woodbury, Burlington County.
A Necrocarcinus rathbunae from around this time (its own age range is 72.2–83.6 million years) was dug up about 3.1 km from here, in the Woodbury, Burlington County.
A Tetracarcinus subquadratus from around this time (its own age range is 72.2–83.6 million years) was dug up about 3.1 km from here, in the Woodbury, Burlington County.
Around 100 million years ago
A Linuparus kleinfelderi from around this time (its own age range is 89.8–93.9 million years) was dug up about 26 km from here, in the Raritan.
An Ambonicardia from 100 million years ago was dug up about 29 km from here, in the Raritan.
A Corbula from 100 million years ago was dug up about 29 km from here, in the Raritan.
Around 200 million years ago
A Hypuronector limnaios from around this time (its own age range is 205.7–227.3 million years) was dug up about 6.0 km from here, in the Lockatong (Nursey), Hudson County.
A Tanytrachelos ahynis from around this time (its own age range is 205.7–227.3 million years) was dug up about 6.0 km from here, in the Lockatong (Nursey), Hudson County.
A Semionotus from around this time (its own age range is 205.7–227.3 million years) was dug up about 6.0 km from here, in the Lockatong (Nursey), Hudson County.
We show these places to the nearest few kilometres rather than pinning them exactly. The scientists who recorded them know the spot far better than that — the full record is one click away in the Paleobiology Database, and it is free for anyone to read. We round them here because a map made for children is not a map for digging things up, not because anything is being hidden.
What changed?
The plate model places this ground at every age on the page, further south the further back you go. Where a piece of surface was is not a description of what was happening on it.
The rock at the surface today is younger than all of it. The geological map of this exact point returns Manhattan Formation, undivided.
This is a box around one city, and New York State reaches four hundred kilometres west of it into rock this page never touches. Nothing here is a statement about the state.
Try it yourself
Everything in all four piles needed water. The land animals drank it, the sea creatures lived in it, and the ones in the middle did both.
Use this page for what a near-tie really means. Two numbers being close only tells you something if both were measured the same way — and here they were not: finding a fossil depends on where people dug.
If you found twice as many land animals as sea creatures, would that mean there was twice as much land? What else could it mean?
How sure are we?
Column facts describe an area of thousands to tens of thousands of km², centred tens of kilometres from the town coordinate. They are claims about a region, never about the rock beneath the town.
Fossil facts are a bounding-box sample around the town, each with its own distance from it; a fossil is never "here". The absence of fossils is not evidence of the absence of life — only of the absence of a recorded, published dig in this box.
Positions are model outputs, not observations. Independent plate models disagree by hundreds of kilometres at these ages, and that spread is the honest size of the uncertainty.
The land/sea question is answered only by the regional rock and the local fossils, separately, and never by the reconstruction — which says where this ground was and cannot say whether it was wet. There is deliberately no single field holding a one-word answer, because answering in one word would require merging a regional claim with a local one (CLAUDE.md rule 5). The nearby fossils are reported as a census of what has been found — which kinds are present, and how many of each — and never counted into a verdict: occurrence records are not statistically equivalent observations, so a plurality of them cannot establish an environment (science review, 2026-08-30).
Fossils are binned to their nearest slice age by age-range midpoint, with boundaries at the inter-slice midpoints 83, 125, 175 and 225 Ma. Those boundaries are an editorial choice, not a published stratigraphic scheme; a reviewer may prefer stage boundaries. Every occurrence keeps its own age range so the choice can be re-examined.
Sources
Macrostrat — the rock of the regionRead from version 2.3.9 of its data service on 2 September 2026.Peters, S.E. et al. Macrostrat: a platform for geological data integration and deep-time research. https://macrostrat.org, accessed on (date)Palaeogeography: Wright, N., Zahirovic, S., Müller, R. D., and Seton, M. Towards community-driven paleogeographic reconstructions: integrating open-access paleogeographic and paleobiology data with plate tectonics. Biogeosciences 10:1529-1541
The Paleobiology Database — the fossils dug up nearbyPBDB publishes no dataset version string; the data-service path (data1.2) and the datainfo access_time bound this claim.Fossil occurrence data from the Paleobiology Database (https://paleobiodb.org), released under CC0 1.0.Palaeo-coordinate cross-check (Paleobiology Database `pgm=gplates`): Wright et. al., 2013; Towards community-driven paleogeographic reconstructions.Palaeo-coordinate cross-check (Paleobiology Database `pgm=scotese`): Scotese, C.R., 2021. An Atlas of Paleogeographic Maps: The Seas Come In and the Seas Go Out, Annual Reviews of Earth and Planetary Sciences, v. 49, p. 669-718.Palaeo-coordinate cross-check (Paleobiology Database `pgm=seton`): Seton et. al., 2012; Global continental and ocean basin reconstructions since 200 Ma.
The EarthByte plate model — where this ground used to beMULLER2019 version 3.0, run with pyGPlates 1.0.0, licensed CC BY 4.0.GPlates: Müller, R. D., Cannon, J., Qin, X., Watson, R. J., Gurnis, M., Williams, S., Pfaffelmoser, T., Seton, M., Russell, S. H. J., Zahirovic S. (2018). GPlates: Building a virtual Earth through deep time. Geochemistry, Geophysics, Geosystems, 19, 2243-2261. https://doi.org/10.1029/2018GC007584Reconstructions computed with the GPlates Web Service (EarthByte Group, The University of Sydney).Plate model: Müller, R. D., Zahirovic, S., Williams, S. E., Cannon, J., Seton, M., Bower, D. J., Tetley, M. G., Heine, C., Le Breton, E., Liu, S., Russell, S. H. J., Yang, T., Leonard, J., and Gurnis, M. (2019), A global plate model including lithospheric deformation along major rifts and orogens since the Triassic. Tectonics, vol. 38, https://doi.org/10.1029/2018TC005462. Licensed CC BY 4.0.Plate model: Zahirovic, S., Eleish, A., Doss, S., Pall, J., Cannon, J., Pistone, M., Tetley, M. G., Young, A., & Fox, P. (2022). Subduction kinematics and carbonate platform interactions. Geoscience Data Journal, 9(2), p.371-383. Licensed CC BY 4.0.Coastline and static-polygon data by the EarthByte Group, licensed CC BY 3.0 Unported.
This record was assembled on from the datasets above. The ancient positions are reconstructions from a published plate model, not observations.
