Everton Formation

Everton Formation
Stratigraphic range: Middle Ordovician
Type Formation
Unit of none
Sub-units Calico Rock Sandstone Member, Jasper Limestone Member, Kings River Sandstone Member, Newton Sandstone Member, Sneeds Limestone Lentil
Underlies St. Peter Sandstone
Overlies Powell Formation
Thickness 300 to 650 feet
Lithology
Primary Limestone, dolostone, sandstone
Other Shale, conglomerate, chert
Location
Region Arkansas and Illinois
Country United States
Type section
Named for Everton, Boone County, Arkansas[1]
Named by Edward Oscar Ulrich

The Everton Formation is a geologic formation in northern Arkansas that dates to the middle Ordovician Period[2]. Unconformities separate this formation from the underlying Powell Formation and the overlying St. Peter Sandstone Formation. Named for the town of Everton in Boone County, Arkansas in 1907, the Everton Formation is composed primarily of dolostone, limestone, and sandstone.

Stratigraphy

Five named members of the Everton Formation are recognized (in stratigraphic order):

  • Jasper Limestone Member
  • Newton Sandstone Member
  • Calico Rock Sandstone Member
  • Kings River Sandstone Member
  • Sneeds Limestone Lentil

See also

References

  1. ↑ Purdue, A.H. (1907). "Cave-sandstone deposits of the southern Ozarks". Geological Society of America Bulletin. 18 (1): 251–256.
  2. ↑ Everton Formation, Arkansas Geologic Survey, Ozark Plateaus, Ordovician
  • Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.


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