The geological history of our planet is one of constant, slow-motion transformation. A specific coordinate on a modern map may seem permanent, but over millions of years, that patch of earth has migrated across the globe. Depending on where you are standing today, that same piece of crust may have once been a tropical seabed, a glacial shelf, or a volcanic wasteland.

This is the experience offered by Paleolatitude.org, a new tool developed by an international team of Earth scientists. By plugging in a modern location, users can retrace the geographical journey of their home across deep time, tracing a path that leads back to the era of the supercontinent Pangaea.

Tracing the blue line of deep time

The tool provides a data-driven visualization of plate tectonics. Once a user enters a location, the site generates a chart on the left side of the screen. The Y axis represents latitude, while the X axis shows the age of the earth in millions of years, labeled as age (Ma).

By following a blue line across this chart, a user can eyeball whether their specific coordinate drifted north or south over the last 320 million years. For instance, the tool can visualize the specific latitudinal shift of Washington, D.C., over that vast timeline. As Gizmodo notes, the tool does not provide an animated view of the landmass migrating across a globe, nor does it reveal changes in longitude—the east-to-west movement.

These data points allow researchers to visualize the historical positioning of landmasses. Between 320 million and 200 million years ago, the North American continent was not an isolated landmass but was contiguous with Europe, Africa, and South America. Together, they formed Pangaea.

The map began to fracture roughly 200 million years ago. A three-pronged fissure tore the supercontinent asunder, creating a volcanic rift zone. Magma surged through the weakened crust, unleashing eruptions that spewed ash and debris. As the continents diverged, the widening gaps between them eventually formed the Atlantic basin, shifting landmasses into the positions they hold today.

Solving the puzzle of the Netherlands

The creation of the tool was not merely for novelty; it was born from a specific geographical puzzle in the Netherlands. Geoscientists studying fossils in Winterswijk found remains of flora and fauna that appeared to belong in the modern-day Persian Gulf.

This discovery presented a dilemma: was the entire planet a sweltering sauna during that period, or had the land itself moved? The researchers at Utrecht University used their model to find the answer, noting that Latitude determines the angle of the sun’s rays and thus also the local climate,.

The tool confirmed that 245 million years ago, the Netherlands possessed a desert climate. This was not solely the result of a warmer global temperature, but because the landmass was physically located at the same tropical latitude as the modern Persian Gulf.

This distinction is critical for geoscientists. By isolating the effect of latitude, they can determine whether ancient environmental changes were caused by global climate shifts or simple tectonic movement. This allows for a more detailed reconstruction of the paleogeographic conditions that existed in the prehistoric past.

The “nerdy work” of unfolding mountains

Building the Utrecht Paleogeography Model required a decade of effort. Professor Douwe van Hinsbergen, a professor of global tectonics and paleogeography at Utrecht University, told Gizmodo that It took 10 years and a lot of nerdy work to get this done,.

The reconstruction process relies on a two-step methodology. First, scientists perform a process where they unfold mountain ranges. This allows them to see how tectonic plates moved relative to one another before they were compressed and distorted by collisions.

This process revealed the existence of landmasses that have since vanished. The researchers identified traces of lost continents, including Argoland, Greater Adria, and the Tethys Himalayas. These regions were eventually swallowed by the Earth’s mantle, but they left fingerprints in the folded rocks of Indonesia and the Mediterranean.

“This means that, for the first time, a truly global model is now available that allows you to link those rocks to their original plates, which have since disappeared into the Earth’s mantle. The global journey of those rocks can now also be traced,” Professor Douwe van Hinsbergen, Utrecht University

The second step involves the magnetic minerals mentioned above. By analyzing these minerals, the team could pinpoint the original location of these plates on the globe and chart their movement over millions of years. This allowed the team to include intensely deformed regions—such as the Caribbean and the Himalayas—that previous reconstructions had omitted.

“My colleagues and I have reconstructed all those regions in enormous detail,” Professor Douwe van Hinsbergen, Utrecht University

Mapping the history of biodiversity

While the tool is accessible to the public, its primary utility lies in the field of paleontology. By identifying the exact historical locations of fossil-rich rocks, researchers can track how biodiversity shifted across different climates.

This capability allows scientists to analyze how species responded to rapid temperature changes and ancient mass extinctions. When a researcher knows the precise latitude of a fossil find, they can better understand the environmental pressures that drove evolution or extinction in that specific region.

The project provides a systematic way to track the movement of geological materials. As van Hinsbergen explained, the model accounts for relics of plates that once existed at the Earth’s surface but have gone into the mantle, ensuring that the history of the planet’s surface is not lost simply because the land itself has been recycled into the interior of the Earth.

The ability to link a modern coordinate to a tropical desert or a volcanic rift 200 million years ago allows researchers to view a location as part of a long-term migratory process. By analyzing these shifts, scientists can better understand how the current distribution of continents resulted from the movement of ancient plates across the globe.