how can scientists use the fossil record and faunal succession from locations around the world to determine the geologic timescale ?

Paleontologists want to know the history of evolution and extinction of fossil species through geologic time. To do that, they try to study all of the fossils that have been preserved in sedimentary rocks. That's called the fossil record. Paleontologists have been collecting fossils from sedimentary rock layers around the world for over two hundred years.

Explanation:

Their goal is to figure out the succession of species through all of geologic time. Once that succession is known, it serves as a scale of geologic time. Then, if you find a particular fossil in a rock, you know where that rock fits into the geologic time scale.

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