| Bloyd Formation | |
|---|---|
| Stratigraphic range: Pennsylvanian | |
 Fossil from the Bloyd Formation | |
| 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.
- ^ Croneis, Carey (1930). "Geology of the Arkansas Paleozoic area" (PDF). Arkansas Geological Survey Bulletin. 3. Archived from the original (PDF) on 2017-01-25. Retrieved 2018-01-28.
- ^ Chandler, Angela; Zachry, Doy (2010). "Parthenon Sandstone: a prominent new member of the Morrowan Bloyd Formation, Pennsylvanian of north-central Arkansas (abstract)". Geological Society of America Abstracts with Programs. 42 (2): 70. Retrieved 28 January 2018.
- ^ McFarland, John David (2004) [1998]. "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Survey Information Circular. 36: 14. Archived from the original (PDF) on 2016-12-21. Retrieved 2018-01-28.
- ^ Purdue, A. (1907). "Description of the Winslow quadrangle". U.S. Geological Survey Geologic Atlas of the United States. 154: 2, 3.