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geological period

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.02 sec.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.geological period - a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"
period
geologic time, geological time - the time of the physical formation and development of the earth (especially prior to human history)
geological era, era - a major division of geological time; an era is usually divided into two or more periods
epoch - a unit of geological time that is a subdivision of a period and is itself divided into ages
glacial epoch, glacial period, ice age - any period of time during which glaciers covered a large part of the earth's surface; "the most recent ice age was during the Pleistocene"


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? Mentioned in ? References in classic literature
 
I have said that Walden has no visible inlet nor outlet, but it is on the one hand distantly and indirectly related to Flint's Pond, which is more elevated, by a chain of small ponds coming from that quarter, and on the other directly and manifestly to Concord River, which is lower, by a similar chain of ponds through which in some other geological period it may have flowed, and by a little digging, which God forbid, it can be made to flow thither again.
Walden & on the Duty of Civil Disobedience by Thoreau, Henry David View in context
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