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")[5]
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.
^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.
^
abcRigby, J. Keith; Manger, Walter L. (14 July 2015). "Morrowan lithistid demosponges and hexactinellids from the Ozark Mountains of northwestern Arkansas". Journal of Paleontology. 68 (4): 734–746.
doi:
10.1017/S0022336000026184.
S2CID131850370.
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")[5]
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.
^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.
^
abcRigby, J. Keith; Manger, Walter L. (14 July 2015). "Morrowan lithistid demosponges and hexactinellids from the Ozark Mountains of northwestern Arkansas". Journal of Paleontology. 68 (4): 734–746.
doi:
10.1017/S0022336000026184.
S2CID131850370.