geologic column

geologic column
noun
1. : a columnar diagram that shows the rock formations of a locality or region and that is arranged to indicate their relations to the subdivisions of geologic time
2. : the sequence of rock formations in a geologic column

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geologic column,
the succession of rocks, in order from oldest to youngest, that are known to exist on the earth as a whole or in any given region.

Useful english dictionary. 2012.

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