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chapter 11

TermDefinition
eon largest units of geologic time
eras eras are subdivided into periods
periods periods are subdivided into epochs
epochs a division of time that is a subdivision of a period and is itself subdivided into ages, corresponding to a series in chronostratigraphy
mass extinction the extinction of many species on earth within a short period of time
land bridge connects two continents that were previously separated
geographic isolation the separation of a population of organisms from the rest of its species due to some physical barrier such as a mountain range or an ocean
Paleozoic era oldest era of the phanerozoic eon
mesozoic era middle era of the phanerozoic eon
cenozoic era youngest era of the phanerozoic eon
inland sea body of water formed when ocean water floods continents
coal swamp oxygen poor environment where over time plant material changes into coal
superconinent an ancient landmass which separated into present day continents
dinosaurs dominant mesozoic land vertebrates that walked with legs positioned directly below their hips
plesiosaurs
Created by: vestcyp
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