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Geologic Time Scale

Across
A fossil that is useful for dating and correlating the strata in which it is found.
It is the longest of the Phanerozoic eras, lasting from 540 to 250 million years ago.
Types of rock that are formed by the deposition and subsequent cementation of mineral or organic particles on the floor of oceans or other bodies of water at the Earth's surface.
A system of chronological dating that relates geological strata to time.
An indefinite and very long period of time, often a period exaggerated for humorous or rhetorical effect.
The theory that changes in the earth's crust during geological history have resulted chiefly from sudden violent and unusual events.
An interval of geological time from about 252 to 66 million years ago.
A period of time in history or a person's life, typically one marked by notable events or particular characteristics.
A fossil formed when an animal, plant, or other organism dies and is covered by sediment, its flesh decays and bones deteriorate due to chemical reactions, and a cavity remains below the ground surface.
Down
Formed from an organism moving in some way, leaving behind a trace or track.
A long and distinct period of history with a particular feature or characteristic.
Earliest part of Earth's history, set before the current Phanerozoic Eon.
The theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.
He originated the theory of uniformitarianism.
About 65 million years, from the end of the Cretaceous Period and the extinction of non-avian dinosaurs to the present
1st Baronet, FRS was a Scottish geologist who popularised the revolutionary work of James Hutton
A fossil formed when an animal, plant, or other organism dies, its flesh decays and bones deteriorate due to chemical reactions.