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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]
Tullimonstrum gregarium, an enigmatic soft bodied bilaterian animal known only from the Mazon Creek deposits. The fossiliferous concretions are found in the Mazon River area of Grundy, Will, Kankakee, and Livingston counties. Additional fossils are found in LaSalle County, Illinois; between the Vermilion River and Marseilles, Illinois.
Anhydritic evaporite deposits are present in places. [2] The conglomerate was deposited by rivers in flood, with the Chapel Rock member, which contains deltaic deposits, representing transgression as the conglomerate cones became submerged; the Miners Castle member was deposited further from the shoreline, representing shelf deposits. [3]
This article about a specific stratigraphic formation in Illinois is a stub. You can help Wikipedia by expanding it.
The Glen Park Formation is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period. See also. Earth sciences portal;
The Altamont Formation is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period. See also. Earth sciences portal;
Pages in category "Deltaic deposits" The following 112 pages are in this category, out of 112 total. This list may not reflect recent changes. A. Abrahamskraal Formation;
The McNairy Formation was formed as a deltaic deposit. The upper and lower parts consists of cross-bedded white to light grey micaceous sand. The middle section is made up of grey to blackish silt, with beds of lignite. This formation is up to 450'. [2]