The strangest thing, when you look at one city after another paleogeographic mapis accepting that that fixed point is fixed only for us. Rome, Milan, Washington, any address written on a bill or a train ticket: everything seems nailed there, with its sidewalks, buildings, streets, administrative borders. Then an online tool comes along, you enter a location, you move the cursor over time, and the floor beneath your feet loses some of its arrogance. That place, 320 million years ago, had another latitude, another possible climate, another position within an Earth that was preparing Pangea, the great supercontinent which in school textbooks seems like a compact spot and instead was a living, mobile world, full of fractures.
The public instrument is called Paleolatitude.org 3.0 and is based onUtrecht Paleogeography Modela model built to reconstruct the movement of the Earth’s plates and return rocks, fossils and fragments of crust to the place they were when they formed. The work, published on April 29, 2026, features among the main names Douwe JJ van Hinsbergen, Bram Vaes and Emilia B. Jarochowska, with an international group linked to Earth sciences, in Utrecht and the CEREGE center in Aix-en-Provence, France. The model enters the calculator with GPlates files, goes back up to 320 million years ago and also includes geographical units that today are crushed and overlapped within the mountain ranges.
Cities change sky
Latitude seems like a harmless coordinate, a line from an atlas. Instead it decides how much sunlight reaches an area, how obliquely the rays fall, what type of climate can take shape. For those who study ancient climate, biodiversity and great extinctions, knowing where a rock is found today is useful up to a certain point. It matters much more to understand where that rock was when it was deposited, when it imprisoned a fossil, when its minerals recorded a trace of the Earth’s magnetic field.
The case of Winterswijkin the Netherlands, makes the matter less abstract. In that area, fossils of plants and animals that lived about 245 million years ago in an environment reminiscent of the current Persian Gulf were studied: desert, hot, tropical sea. Looking at a modern map, the comparison almost sounds wrong. With the model, however, we can see that that piece of Europe was then much further south, at latitudes comparable to those of Arabia today. The explanation becomes more concrete: that ancient climate also depended on the position, on the slow travel of the plate, on the fact that today’s northern Europe had another face under another sun.
The same logic applies to any location included in the platform. You click on the map, or write the coordinates, and the system returns a paleolatitude curve. The site also allows you to export graphs and data, and for those working with large scientific archives it offers serial calculations on very large datasets. It seems like a game, and for the public in part it is: seeing where one’s home “was” when the continents were elsewhere has an almost childish strength. For geologists and paleontologists, however, that game becomes a working tool.
Missing plaques matter
The most delicate part of the model concerns what disappears on normal maps. The large tectonic plates tell a lot, but the history of the Earth also passes through small fragments, microcontinents, closed ocean basins, strips of crust swallowed up, compressed, crumpled inside mountains born from collisions lasting millions of years. The new system tries to also include these difficult areas, i.e. the geologically deformed territories of the MediterraneanIran, the Himalayas, Tibet, Southeast Asia, and the Caribbean, along with continental fragments that today make up parts of Mongolia, China, and Indochina.
Within this lost geography come names that are unfamiliar outside scientific circles, such as Greater Adriathe Tethys Himalayas And Argoland. Greater Adria was a fragmented continent whose remains partly ended up in the mountains of the Mediterranean area; the Tethys Himalayas recall the Himalayan portions linked to the ancient Tethys ocean; Argoland refers to blocks that detached from the edge of Western Australia and then dispersed in the mosaic of South-East Asia. On a political map they look like ghosts. In the folded rocks of the mountains, however, they still leave recognizable footprints.
To reconstruct these movements, the researchers put together fragments of mountain chains, continental margins and disappeared plates, then placed everything inside an updated paleomagnetic reference. Many rocks contain magnetic minerals which, during formation, orient themselves according to the Earth’s magnetic field. That small physical memory allows us to estimate the ancient latitude, with margins of uncertainty that the new model tries to make more transparent. The paleomagnetic database underlying the global reference has been updated and the system integrates more precise statistical procedures than previous versions.
Fossils with a new address
The usefulness of paleogeographic map it grows when we move from curiosity to biology. A fossil found today in a certain country tells the story of the life of an organism that lived in a place that, millions of years ago, could have been thousands of kilometers away in climatic terms. Studying a species only along the time axis leaves out a huge part of the story. Space is also needed: where it lived, under what light, near which seas, in which climate zone.
To show this leap, the authors also used the new tool on biodiversity data from the Upper Jurassic, calculating a latitudinal gradient for marine organisms and taking into account the uncertainty linked to both the age of the fossils and the paleomagnetic framework. In practice, the model helps to ask more precisely which latitudes have functioned as refuges during extreme changes, which areas have become hostile before others, which groups have migrated, resisted or succumbed when the Earth’s climate changed pace.
The project already looks further back. The stated goal is to extend the model up to approx 550 million years agotowards the Cambrian explosion, the phase in which many forms of complex life appear with new richness in the fossil record. Getting there would mean pushing the same logic even deeper: following life as the crust moves, as oceans open and close, as continents change latitude as if the planet were an enormous room without fixed furniture.
There is something healthy about this downsizing. Cities seem final only because our lives are too short to see them move. The Earth, with its indecent times, does something else. It moves continents, erases oceans, folds seabeds into mountains, brings a piece of Europe towards an Arabian climate and then lets it return north, under rain and bricks. We put license plates, borders, cadastral maps on them. She continues dragging the floor.
