Earth Sci Ch 30 Vocab

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An exposed area of the oldest continental rock, or craton, is called

Ancient tiny animals that lived in oceans & are good index fossils are

A crablike invertebrate that is the most common fossil of the Cambrian is called

Main divisions of an eon are divided into

What is the name of a sea scorpion that lived in the Silurian period?

Ancient plant-looking creatures related to seastars are called

The longest segment of geologic time is

Eras are divided into