Winslow Formation

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Winslow Formation
Stratigraphic range: Carboniferous: Pennsylvanian
Type Formation
Region Arkansas
Country United States
Type section
Named for Winslow, Washington County, Arkansas
Named by George Irving Adams and Edward Oscar Ulrich[1]

The Winslow Formation was a geologic formation in Arkansas, now abandoned and replaced by the Atoka Formation, the Hartshorne Formation, and the lower McAlester Formation (previously Spadra Shale[2])[3][4]. It preserves fossils dating back to the Carboniferous period.

See also[edit]


  1. ^ Adams, G.I.; Ulrich, E.O. (1904). "Zinc and lead deposits of northern Arkansas". U.S. Geological Survey Professional Paper. 24: 29. 
  2. ^ Hendricks, T.A.; Parks, B. (1950). "Geology of the Fort Smith District". U.S. Geological Survey Professional Paper. 221-E. 
  3. ^ Collier, A.J. (1907). "The Arkansas coal field". U.S. Geological Survey Bulletin. 326. 
  4. ^ Purdue, A.H. (1909). Slates of Arkansas. Geological Survey of Arkansas.