Eon - Largest division of geologic time, Pre-Cambrian TIme - The vast period of time from 4600 mya-542 mya in which the first single and multi-celled organisms evolved in Earth's oceans, Era - a long and distinct period of history with a particular feature or characteristic., Epoch - a subdivision of a geologic period, Period - a unit of geologic time into which eras are divided, Mold fossil - a space in a rock that has the shape of the remains of a living thing that once occupied that space., Cast fossil - forms when a mold is filled with sand or mud that hardens into the shape of the organism, Extinction - A term that typically describes a species that no longer has any known living individuals., Paleontologist - A scientist who studies fossils, Paleozoic Era - the part of geologic time 570-245 million years ago ; invertebrates, fishes, amphibians, reptiles, ferns, and cone-bearing trees were dominant,

Geology Vocab

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