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): • Kessler Limestone Member • Dye Shale Member • Parthenon Sandstone Member (also known as the "middle Bloyd sandstone") • Woolsey Member • Baldwin coal (an informal unit at the top of the Woolsey Member) • Brentwood Limestone Member 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. ==Paleontology==