Fossil + GTS Vocab Flashcard

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Timeline of major Earth events

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Geologic Time Scale

Front

A block of time on the geologic time scale with unique rock layers.

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Period

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Division of eons on the geologic time scale separated by mass extinction events

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Era

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First period of the Paleozoic era (570 - 505 million years ago) known for life explosion.

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Cambrian

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Era known as the Time of the Dinosaurs, lasting about 186 million years.

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Mesozoic

Front

Cenozoic is defined as

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Era known as the Rise of Mammals, covering 57.8 million years ago to present (We live in this Era).

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Precambrian is defined as

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Section of prehistoric time 4.5 billion to 570 million years ago, start of life as single-celled then multicellular organisms.

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Cast is defined as mineralized sediment that fills the mold recreating the shape of the remains.

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mineralized sediment that fills the mold recreates the shape of the remains

Front

Mineralized impression of an organism in sediment.

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Mold

Front

A fossil useful for dating geologic layers, lived briefly and is common.

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Index fossil