Geologic Time Scale and Fossils

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What is the Geologic Time Scale?

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A system of chronological dating that relates geological strata to time, used to describe the timing and relationships of events in Earth's history.

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What are fossils?

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Remains or traces of ancient organisms preserved in rock.

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What is the Precambrian period?

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The earliest part of Earth's history, covering about 88% of geological time, before the Cambrian period.

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What is the Paleozoic Era?

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A major era in the geologic time scale that lasted from about 541 to 252 million years ago, known for the development of marine life and the first land plants.

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What is the Mesozoic Era?

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The era known as the 'Age of Reptiles,' lasting from about 252 to 66 million years ago, during which dinosaurs thrived.

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What is the Cenozoic Era?

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The current geological era, beginning about 66 million years ago, characterized by the dominance of mammals and birds.

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What is a paleontologist?

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A scientist who studies fossils to understand the history of life on Earth.

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What is a mold fossil?

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A fossil that forms when an organism leaves an impression in sediment, which hardens into rock.

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What is a cast fossil?

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A fossil that forms when a mold is filled with minerals or sediment, creating a replica of the original organism.

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What are preserved remains?

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Fossils that consist of actual parts of the organism, such as bones, teeth, or shells, that have been preserved.

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