| Duncan Formation | |
|---|---|
| Stratigraphic range: Permian | |
| Type | Formation |
| Location | |
| Region | Oklahoma |
| Country | United States |
| Type section | |
| Named for | Duncan, Stephens County, Oklahoma |
| Named by | Charles Newton Gould, 1924 [1] |
The Duncan Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Permian period.
Syndyodosuchus is an extinct genus of temnospondyl within the family Actinodontidae. It is known from the Permian Inta Formation of European Russia.
The Barneston Formation is a geologic formation in Kansas, extending into Oklahoma and Nebraska. It preserves fossils dating back to the Permian period.
The Viola Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Ordovician period.
The Blaine Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Permian period.
The Chickasha Formation, which is part of the El Reno Group, is a geologic formation in Oklahoma. It preserves fossils dating back to the Roadian stage of the Middle Permian. These include, among others, the dissorophoid temnospondyl Nooxobeia gracilis, the lepospondyl Diplocaulus parvus, and the captorhinid Rothianiscus robusta, initially called Rothia robusta by Everett C. Olson. Many of these fossils were indicated to have come from the Flowerpot Shale, but these actually come from the Chickasha Formation, according to the current nomenclature. The age of the formation was long debated because Olson based part of his argument on fragmentary fossils that he interpreted as therapsids, an interpretation that was not widely accepted. Worse, one of them, Watongia, was later shown to be a varanopid.
The Dog Creek Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Permian period.
The Enid Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Permian period.
The Hennessey Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Permian period.
The Whitehorse Formation is a geologic formation in Nebraska and Oklahoma. It preserves fossils dating back to the Permian period.
The El Reno Group is a geologic group in Oklahoma. It preserves fossils dating back to the Permian period. The Chickasha Formation, which is part of this group, contains the geologically most recent Permian continental vertebrates (Roadian) known from North America. These include one of the most recent lepospondyls, a dissorophoid, and some fragmentary fossils of Steppesaurus that Everett C. Olson interpreted as one of the oldest known therapsids, an interpretation that has not been widely accepted.
The Leonard Series is a geologic group in Oklahoma. It preserves fossils dating back to the Permian period.
The Admiral Formation is a geologic formation in Texas. It preserves fossils dating back to the Permian period.
The Belle Plains Formation is a geologic formation in Texas. It preserves fossils dating back to the Permian period.
The Delaware Mountain Formation is a geologic formation in the Delaware Mountains of Texas. It preserves fossils dating back to the Permian period.
The Petrolia Formation is a geologic formation in Texas. It preserves fossils dating back to the Permian period.
The Pease River Group is a geologic group in Texas Red Beds. It preserves fossils dating back to the Permian period, including some of the geologically most recent continental and coastal vertebrates of the Permian in North America. These are preserved in the San Angelo Formation, which is probably of early Roadian age. They include several fragmentary fossils that Everett C. Olson interpreted as the earliest therapsids, an interpretation that has not been widely accepted.
The Minnekahta Formation is a geologic formation in Wyoming, United States. It preserves fossils dating back to the Permian period.
The Satanka Formation is a geologic formation in Wyoming. It preserves fossils dating back to the Permian period.
The Maroon Formation is a geologic formation in Colorado. It preserves fossils dating back to the Permian period. It is the primary formation of sandstone that lends the vivid red color to the hills around Glenwood Springs, Colorado.
The Arcturus Formation is a geologic formation in Nevada and Utah, United States. It preserves fossils dating back to the Permian period.
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