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This list of the prehistoric life of Illinois contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Illinois. Precambrian [ edit ]
This list of the Paleozoic life of Illinois contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Illinois and are between 538.8 and 252.17 million years of age.
The environment of Pennsylvanian Illinois was comparable to the modern Amazon River delta. [9] Almost every Pennsylvanian deposit in Illinois preserves evidence of this ancient flora and such deposits are located in almost every region of the state. [12] The vegetation of these ancient swamps became Illinois' modern coal deposits. [9] [11]
Although there are no radiocarbon dates available from Gentleman Farm, based on dates obtained from sites with similar artifacts, the site is thought to date to approximately A.D. 1200–1500. [ 1 ] No house structures were present at the site, and based on the lack of household artifacts such as manos and milling stones, it is not thought to ...
Ordovician rocks in Illinois are divided into three series, each separated by an unconformity; from oldest to youngest, these are the Canadian, Champlainian, and Cincinnatian series. Ordovician features in Illinois include the now-buried Glasford Structure in Peoria County , a crater caused by a meteorite impact roughly 455 million years ago.
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The earliest evidence for life on Earth includes: 3.8 billion-year-old biogenic hematite in a banded iron formation of the Nuvvuagittuq Greenstone Belt in Canada; [30] graphite in 3.7 billion-year-old metasedimentary rocks in western Greenland; [31] and microbial mat fossils in 3.48 billion-year-old sandstone in Western Australia.
Howard, Robert P. Mostly Good and Competent Men: Illinois Governors 1818–1988 (1988) Hutchinson, William. Lowden of Illinois the Life of Frank O. Lowden 2 vol (1957) governor in 1917–21; Jensen, Richard. Illinois: A History (2001). interpretive history using model of traditional-modern-postmodern; online; Keating, Ann Durkin (2018).