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Polk Creek Shale

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Polk Creek Shale
Stratigraphic range: Ordovician
TypeFormation
Unit ofnone
Sub-unitsnone
UnderliesBlaylock Sandstone
OverliesBigfork Chert
Thickness50 to 225 feet
Lithology
PrimaryShale
Location
RegionArkansas, Oklahoma
CountryUnited States
Type section
Named forPolk Creek, Montgomery County, Arkansas
Named byAlbert Homer Purdue

The Polk Creek Shale is a Late Ordovician geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. First described in 1892, this unit was not named until 1909 by Albert Homer Purdue in his study of the Ouachita Mountains of Arkansas. Purdue assigned Polk Creek in Montgomery County, Arkansas as the type locality, but did not designate a stratotype. As of 2017, a reference section for this unit has yet to be designated.

Paleofauna

Graptolites

C. mississippiensis
C. putillus
C. tridentatus var. maximus
C. ulrichi
D. anceps
D. complanatus
D. elegans
D. forehammeri flexuosus
D. calcaratus
D. calcaratus var. trifidus
D. crassitestus
G. quadrimucronatus
G. quadrimucronatus var. paucithecatus
N. velatus
O. quadrimucronatus
O. spinigerus

See also

References

  1. McFarland, John David (2004) . "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 19. Archived from the original (PDF) on 2016-12-21. Retrieved 2018-01-09.
  2. ^ Purdue, A.H. (1909). Slates of Arkansas. Geological Survey of Arkansas. pp. 30, 35.
  3. Griswold, L.S. (1892). "Whetstones and the novaculites". Annual Report of the Geological Survey of Arkansas for 1890. 3.
  4. ^ Miser, Hugh D.; Purdue, A.H. (1929). "Geology of the De Queen and Caddo Gap quadrangles, Arkansas". U.S. Geological Survey Bulletin. 808: 40–42.
  5. ^ Decker, Charles E. (1935). "Graptolites of the Sylvan Shale of Oklahoma and Polk Creek Shale of Arkansas". Journal of Paleontology. 9 (8).
  6. ^ Decker, Charles E. (1936). "Some tentative correlations on the basis of graptolites of Oklahoma and Arkansas". Bulletin of the American Association of Petroleum Geologists. 20 (3): 301–311.


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