period - the interval of geologic time that is subdivided into epochs, epoch - the shortest interval of geologic time, geologic time scale - a timeline geologists created to organize the events that have occurred during Earth's history, mass extinction - an event that marks the death of a large number of species within a relatively short amount of geologic time, era - the interval of geologic time that is subdivided into periods, fossil - naturally preserved remains or traces of an organism that lived long ago, inland sea - a large body of water that covers a central area of a continent, coal swamp - an area with low oxygen where plants died and turned into coal, supercontinent - a large landmass in early geologic time that is thought to form the present continents, plesiosaur - an extinct marine reptile of the Mesozoic era, pterosaur - a type of extinct flying reptile that lived during the Mesozoic era, dinosaur - a group of reptiles that appeared in the Mesozoic era and had limbs extending directly beneath the body,

geologic time scale

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