Bloyd Formation | |
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Stratigraphic range: Pennsylvanian | |
Type | Formation |
Sub-units | Baldwin coal,[1] Brentwood Member, Dye Shale Member, Kessler Limestone Member, Parthenon Sandstone Member,[2] and Woolsey Member[3] |
Underlies | Atoka Formation |
Overlies | Hale Formation |
Lithology | |
Primary | Shale |
Other | Sandstone, limestone |
Location | |
Region | Arkansas |
Country | United States |
Type section | |
Named for | Bloyd Mountain, Washington County, Arkansas[4] |
Named by | Albert Homer Purdue |
The Bloyd Formation, or Bloyd Shale, is a geologic formation in Arkansas. It preserves fossils dating back to the Carboniferous period.
The Bloyd Formation conformably overlies the Hale Formation and unconformably underlies the Atoka Formation. Five formal and one informal members are recognized in the Bloyd Formation (in stratigraphic order):
In the eastern parts of the Ozarks in Arkansas, the Bloyd Formation becomes undifferentiated with the underlying Hale Formation and is called the Witts Springs Formation.
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