Answer:
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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Both fossil record and faunal succession are the materials which tells us about time scale.
Scientists use the fossil record and faunal succession from locations around the world in order to determine the geologic timescale because both fossil record and faunal succession are the tools which provides information about the time scale.
Faunal succession is the fundamental tool of stratigraphy and consist the basis for the geologic time scale whereas the main goal of fossil record is to figure out the succession of species through all of geologic time so we can conclude that both fossil record and faunal succession are the materials which tells us about time scale.
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