eon - the longest division of geologic history, epoch - the shortest division of geologic history, Precambrian Time - the longest period of Geologic history in which life began to develop, Paleozoic Era - the division of geologic history in which invertebrates, fish, amphibians, and reptiles evolved, Mesozoic Era - the period of geologic history known as the age of the dinosaurs; when mammals and birds first appeared, Cenozoic Era - the current period of geologic history dominated by mammals, relative age - comparative age; one way in which the age of rocks and fossils are determined, Law of Superposition - in undisturbed sedimentary rocks, the oldest rock layers and fossils within those rocks are found at the bottom, index fossil - a common, widely distributed, short-lived fossil that is used as a marker to determine the age of rock layers, fossil record - fossils providing us with a record of the past life and environments on Earth, fossils - the remains or trace of plant and animal life from the past, sedimentary rock - the type of rock in which fossils can be found, trace fossil - a fossil that provides evidence for organism activity, carbon film - type of fossil that preserves plants and soft parts of organism as a "stamp" on rock, original remains - organism trapped in amber, tar, or ice, mold fossil - the hollowed out cavity left behind after an organism disintegrates, mass extinction - wide-spread loss of life , adaptation - a trait or behavior that allows an organism to survive, natural selection - organisms that posses traits that are well suited to their environment are more likely to survive and reproduce, volcanic activity - a cause of extinction that results in increased greenhouse gases in the atmosphere, asteroid - a cause of mass extinction that results in debris being thrown into the atmosphere blocking sunlight,

Geologic History Vocabulary Review

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