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

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

Mats of cyanobacteria that formed domes in Precambrian time are called

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

A modern human or a recent human like ancestor is called

The longest segment of geologic time is

Main divisions of an eon are divided into

Eras are divided into

Ancient plant-looking creatures related to seastars are called

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

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