Fort Riley Limestone

For the Miocene geologic unit in North Carolina, USA, see Silverdale Formation.

The Fort Riley Limestone is a Kansas Permian stratigraphic unit of member rank and historic building stone, sold commercially as fine-grained Silverdale, having at one time been quarried at Silverdale, Kansas.^[4] This limestone outcrops in east-central Kansas, extending into northeast-central Oklahoma and southeastern Nebraska, in the Midwestern United States. Its conspicuous "rim rock" marker horizon outcrop caps the bluffs overlooking the original buildings of Fort Riley, as well as the Marshall Army Airfield opposite the Kansas River.^[5][6][7]

Fort Riley Limestone
Stratigraphic range: Asselian PreꞒ Ꞓ O S D C P T J K Pg N (Gearyan stage)[1][2]
Fort Riley Limestone, J Hill Road, Geary County, Kansas, near Fort Riley
Type	Member
Unit of	Barneston Limestone
Underlies	Holmesville Shale member of the Doyle Shale formation[3]
Overlies	Oketo Shale member of the Barneston Limestone formation
Lithology
Primary	Limestone
Location
Region	Permian Midcontinent Seaway
Country	United States
Type section
Named for	Fort Riley, Kansas

See also

• Earth sciences portal
• Kansas portal
• Oklahoma portal
• Paleontology portal

• List of fossiliferous stratigraphic units in Kansas
• List of fossiliferous stratigraphic units in Nebraska
• List of fossiliferous stratigraphic units in Oklahoma
• Paleontology in Kansas
• Paleontology in Nebraska
• Paleontology in Oklahoma