| Bloyd Shale | |
|---|---|
| Stratigraphic range: Carboniferous | |
| Type | Formation |
| Location | |
| Region | Arkansas |
| Country | United States |
The Bloyd Shale is a geologic formation in Arkansas. It preserves fossils dating back to the Carboniferous period.
The Claiborne Formation or Claiborne Group is a geologic formation in Arkansas, Illinois, Kentucky, and Texas. It preserves fossils dating back to the Paleogene period.
The Midway Group is a geologic group in the Mississippi Embayment of Tennessee, Arkansas, Mississippi, Louisiana, Texas and Alabama. It preserves fossils dated to the Paleogene period.
The Morrow Group was a geologic group in Arkansas that is now abandoned and replaced by the Bloyd Formation and the Hale Formation. It preserves fossils dating back to the Pennsylvanian period.
The Pentremital Limestone Group is a geologic group in Arkansas. It preserves fossils dating back to the Carboniferous period.
The Navarro Group is a geologic group in Arkansas, Texas and Coahuila, Mexico. It preserves fossils dating back to the Cretaceous period.
The Taylor Group is a geologic group in Arkansas. It preserves fossils dating back to the Cretaceous period.
The Batesville Sandstone is a geologic formation in northern Arkansas, United States, that dates to the Chesterian Series of the late Mississippian. The base of the Batesville Sandstone, named the Hindsville Limestone Member, unconformably lies on the Moorefield Formation.
The Witts Springs Formation is a sandstone geologic formation in Arkansas with thin layers of limestone, shale, and siltstone. It preserves fossils dating back to the Carboniferous period.
The Arkadelphia Marl, also called the Arkadelphia Formation, is a geologic formation in Arkansas in Clark, Nevada, and Hempstead counties. It preserves fossils dating back to the Cretaceous period.
The Brownstown Marl is a geologic formation in Arkansas. It preserves fossils dating back to the Cretaceous period.
The Comanche Formation is a geologic formation in Arkansas. It preserves fossils dating back to the Cretaceous period.
The De Queen Formation, formerly known as the DeQueen Limestone Member is a Mesozoic geological formation located in southwestern Arkansas and southeastern Oklahoma in the United States. Fossil sauropod and theropod tracks have been reported from the formation. It preserves fossils dating back to the Cretaceous period, particularly the Albian age.
The Marlbrook Marl is a geologic formation in Arkansas. It preserves fossils dating back to the Cretaceous period.
The Nacatoch Formation is a geologic formation in Arkansas, USA. It preserves fossils dating back to the Cretaceous period.
The Nacatoch Sand is a geologic formation in Arkansas. It preserves fossils dating back to the Cretaceous period.
The Saratoga Chalk is a geologic formation in Arkansas. It preserves fossils dating back to the Cretaceous period, specifically ammonites.
The Everton Formation is a geologic formation in northern Arkansas that dates to the middle Ordovician Period. Unconformities separate this formation from the underlying Powell Formation and the overlying St. Peter Sandstone Formation. Named for the town of Everton in Boone County, Arkansas in 1907, the Everton Formation is composed primarily of dolomite, limestone, and sandstone.
The Winslow Formation was a geologic formation in Arkansas, now abandoned and replaced by the Atoka Formation, the Hartshorne Formation, and the lower McAlester Formation. It preserves fossils dating back to the Carboniferous period.
The Kiamichi Shale or Kiamichi Formation is a geologic formation in Arkansas and Texas. It preserves fossils dating back to the Cretaceous period.
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