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Geologic Time

Across
a division of time that is a subdivision of a period
the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
Type of rock we would find fossils in
The study of the formation, history, materials, and processes of the physical Earth.
Down
An era where humans first appeared
An era where both dinosaurs and mammals appeared
a major division of geological time that is a subdivision of an era
a long and distinct period of history with a particular feature or characteristic.