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Imo Formation

The Imo Formation, or Imo Shale, is a geologic unit in northern Arkansas that dates to the Chesterian Series of the late Mississippian. The Imo is considered to be a member of the upper Pitkin Formation, and is the most recent Mississippian age rock in Arkansas. The Imo Shale unconformably underlies the Pennsylvanian age Hale Formation

Paleontology
===Cephalopods=== • Anthracoceras : A. discusCravenoceras : C. mapesiEndothyraCornigellaGortanellaHealdiaHealdioidesHollinellaMonoceratinaSargentinaYoungiella ==See also==
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