* Fossil distribution: While fossils themselves weren't the primary mover, their distribution across continents was a crucial piece of the puzzle. Finding identical or very similar fossils on continents now separated by vast oceans was a strong indicator that they were once connected. This was particularly compelling for fossils of land animals that couldn't have crossed oceans, like the Mesosaurus, a freshwater reptile found in both South America and Africa.
* Geological evidence: This includes matching rock formations on different continents, like the Appalachian Mountains in North America and the Caledonian Mountains in Scotland. These formations suggested a shared geological history that could only be explained by the continents once being together.
* Paleomagnetic evidence: This refers to the study of the Earth's magnetic field preserved in rocks. It shows that continents have moved significantly over time, as the magnetic poles have shifted and rocks have recorded the direction of the magnetic field at the time they formed.
Fossil symbols played a supporting role by providing a visual aid to illustrate the distribution of fossils. They were used to:
* Show the distribution of similar fossils on different continents: This visually reinforced the argument that continents were once connected.
* Illustrate the concept of continental drift: By comparing fossils from different time periods, scientists could show how the distribution of fossils changed over time, indicating the movement of continents.
It's important to remember that fossil symbols are not the sole evidence for continental drift, but rather one piece of a much larger puzzle. The theory of plate tectonics, which explains continental drift, is based on the combined evidence from multiple disciplines, including geology, paleontology, and geophysics.
