Everton Formation

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 dolomite, limestone, and sandstone.

Everton Formation Stratigraphic range: Middle Ordovician
Collapse breccia (Everton Formation; Arkansas)
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, dolomite, 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

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

• List of fossiliferous stratigraphic units in Arkansas
• Paleontology in Arkansas

References

1. Purdue, A.H. (1907). "Cave-sandstone deposits of the southern Ozarks". Geological Society of America Bulletin. 18 (1): 251–256. doi:10.1130/gsab-18-251.
2. "Everton Formation, Arkansas Geologic Survey, Ozark Plateaus, Ordovician". Archived from the original on 2014-07-14. Retrieved 2014-07-11.

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.