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PLATE TECTONICS
Lesson 1 - Page 4

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So what were the clues that made people start to think? Paleontologists had long recognized that fossils from the east coast of South America and the west coast of Africa had many fossilís in common. Biologists had also noted that living animals like garden snails, earthworms, mussels, and mud minnows also "linked" across the ocean. By the late 1800's, naturalists who explored new territories accumulated more evidence of these biological and paleontological similarities.

Some scientists developed these elaborate "land bridge" theories. Organisms would be able to walk freely along these connections. However, many scientists realized this land bridge theory had some serious problems. Geologists started to visualize a moving continent or what they called "continental drift" to account for similarities.

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