Geologic Time Vocab

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An igneous rock layer formed when magma hardens beneath Earth’s surface.

A type of fossil that provides evidence of the activity of ancient organisms.

Occurs when a large proportion of the earth’s species go extinct in a relatively short period of time.

Uses information about rock layers and the fossil record to determine the age relationships between rocks.

A fossil in which minerals replace all or part of an organism

Found in a narrow time range but widely distributed around the earth.

Gaps in the rock record.

States that the oldest rocks lie on the bottom and the youngest rocks are on top of any undisturbed sequence of sedimentary rocks.