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Ch 14

TermDefinition
Eons The longest units of geologic time
Eras Eons subdivided into smaller units of time
Periods Eras subdivided into smaller units of time
Epochs Periods subdivided into smaller units of time
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 do to some physical barrier, such as a mountain range or oceans
Paleozoic era The oldest era of the Phanerozoic eon
Mesozoic era The middle era of the Phanerozoic eon
Cenozoic era The youngest era of the Phanerozoic eon
Inland sea A body of water formed when ocean water floods continents
Super continent An ancient landmass which separated into present-day continents
Dinosaur Dominant Mesozoic land vertebrates that walked with legs positioned directly below their hips
Plesiosaurs Mesozoic marine reptiles with small heads, long necks, and flippers
pterosaurs Mesozoic flying reptiles with large, batlike wings
Holocene epoch The most recent epoch
Pleistocene epoch The first epoch of the Quaternary period
Ice age A time when a large proportion of earth's surface was covered by glaciers
Glacial grooves grooves made by rocks carried in glaciers
mega-mammals The large mammals of the Cenozoic era
Created by: columsad
Popular Earth Science sets

 

 



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