Blaylock Sandstone

The Blaylock Sandstone is a Silurian geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. First described in 1892,^[4] this unit was not named until 1909 by Albert Homer Purdue in his study of the Ouachita Mountains of Arkansas.^[2][3] Purdue assigned the Blaylock Mountain 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.

Blaylock Sandstone
Stratigraphic range: Silurian
Type	Formation
Unit of	none
Sub-units	none
Underlies	Missouri Mountain Shale
Overlies	Polk Creek Shale
Thickness	up to 1200 feet[1]
Lithology
Primary	Sandstone
Location
Region	Arkansas, Oklahoma
Country	United States
Type section
Named for	Blaylock Mountain, Montgomery County, Arkansas
Named by	Albert Homer Purdue[2][3]

Paleofauna

Graptolites

• Dictyonema^[5]
• Dimorphograptus

D. decussatus^[5]

• Gladiograptus

G. perlatus^[5]

• Monograptus

M. argutus^[5]

M. distans^[5]

M. gregarius^[5]

See also

• Paleontology portal

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