A technique used to date materials based on the decay of certain elements

A fossil that can be used to identify a specific geologic time period.

A record of the major events and diversity of life forms present in Earth's history

a cold blooded vertebrate that lives mostly on land with scaly skin

A warm blooded vertebrate with fur/hair and milk production for nourishment of young

A distinct segment of time in history with a particular specific event or characteristic.

a scientist who studies fossils

a cold blooded vertebrate that lives on land and in water with slimy skin

An organism that lacks a backbone

An organism that has a back bone

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