How long did the Devonian Period last?

During which geologic period were the continents all part of one landmass, with North America and South America joined to Africa?

NYS contains no rock record from the ___________ Period.

During which geologic period did the coal-forming forests occur?

How many years ago did the Phanerozoic Eon begin?

During which geologic period did the initial opening of the Atlantic Ocean occur?

Which of the following major groups of organisms has existed for the longest time?

Which organism existed before the dinosaurs?

What event marked the end of the Mesozoic Era?

Which of the following index fossils existed during the Triassic Period?

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