Fort Riley Limestone

{{For|the Miocene geologic unit in North Carolina, USA|Silverdale Formation}} {{Infobox rockunit | name = Fort Riley Limestone | image = File:Fort Riley Limestone, J Hill Road, Geary County, Kansas 20240608 113059.jpg | caption = Fort Riley Limestone, J Hill Road, Geary County, Kansas, near Fort Riley | type = Member | age = {{Geological range|Asselian}} (Gearyan stage)<ref name="KgsZeller1968a" >{{cite journal |editor=D. E. Zeller |title= The Stratigraphic Succession in Kansas |publisher= University of Kansas Publications, State Geological Survey of Kansas |date= 1968 |journal= Kansas Geological Survey Bulletin |issue= 189 |url= https://www.kgs.ku.edu/Publications/Bulletins/189/08_perm.html |page= Permian System |quote= The '''Gearyan Stage''' (O'Connor, 1963) comprises three groups, the Admire, the Council Grove, and the Chase. It contains about 790 feet of rocks, which are predominantly limestone and shale, and contains units that are remarkably continuous laterally. The Gearyan Stage is named from Geary County in northeastern Kansas. Rocks of this stage are exposed throughout east-central Kansas in a north-northeast-trending belt from Cowley County on the Oklahoma border to Marshall and Brown counties on the Nebraska border. }}</ref><ref name= GeolexSigPub >{{cite web | title = Geologic Unit: Fort Riley | series = Geolex — Significant Publications | work = National Geologic Database | publisher = United States Geological Survey | url = https://ngmdb.usgs.gov/Geolex/UnitRefs/FortRileyRefs_8169.html | access-date = 2024-06-08 }}</ref> | prilithology = Limestone | otherlithology = | namedfor = Fort Riley, Kansas | namedby = | region = Permian Midcontinent Seaway | country = United States | coordinates = | unitof = Barneston Limestone | subunits = | underlies = Holmesville Shale member of the Doyle Shale formation<ref>{{cite web|url=https://pubs.usgs.gov/bul/1060b/report.pdf |title=Geology and Construction-Material Resources of Marion County, Kansas By F. E. BYRNE, C. P. WALTERS, J. L. HILL, and L. RISEMAN on USGS}}</ref> | overlies = Oketo Shale member of the Barneston Limestone formation | thickness = | extent = | area = | map = | map_caption = }}

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.<ref name="AberGrisafe" >{{cite book | author = Susan Ward Aber and David A. Grisafe | title = Petrographic Characteristics of Kansas Building Limestones, Kansas Geological Survey, Bulletin 224 | publisher = University of Kansas Publications, State Geological Survey of Kansas | date = 1982 | url = http://www.kgs.ku.edu/Publications/Bulletins/224/ }}</ref> 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.<ref name="KgsZeller1968b" >{{cite journal |editor=D. E. Zeller |title= The Stratigraphic Succession in Kansas |publisher= University of Kansas Publications, State Geological Survey of Kansas |date= 1968 |journal= Kansas Geological Survey Bulletin |issue= 189 |url= https://www.kgs.ku.edu/Publications/Bulletins/189/08_perm.html |page= Permian System |quote= The Fort Riley is a light-gray to tan, massive to thin-bedded limestone with a minor amount of gray shale. In the basal part there are thin, shaly beds that are overlain by a massive "rim rock," which is a conspicuous outcrop maker. Thin shaly beds and locally clayey shale occurs in the middle part. The upper strata are massive, but less so than the "rim rock." Algae are somewhat conspicuous in the "rim rock." The thickness ranges from about 30 to 45 feet. }}</ref><ref>{{cite map |author1 = Sawin, R.S. |author2= West, R.R. |year= 2010 |title = Geary County |url = https://www.kgs.ku.edu/General/Geology/County/ghj/geary.html |map = T. 11 S., R. 6 E. |map-url = https://www.kgs.ku.edu/General/Geology/County/ghj/ge/ge_6_5.html |publisher = Kansas Geological Survey |series= County Geologic Maps |access-date = 2024-06-09 |quote= —RR— Fort Riley Ls Mbr "rim rock" marker bed }} [map legend]<br/>''Note: The earliest facilities are on the Qpt below the blue-line Pb marker bed.'' </ref><ref>{{cite map |author1 = Sawin, R.S. |author2= West, R.R. |year= 2010 |title = Geary County |url = https://www.kgs.ku.edu/General/Geology/County/ghj/geary.html |map = T. 11 S., R. 6 E. |map-url = https://www.kgs.ku.edu/General/Geology/County/ghj/ge/ge_6_6.html |publisher = Kansas Geological Survey |series= County Geologic Maps |access-date = 2024-06-09 |quote= —RR— Fort Riley Ls Mbr "rim rock" marker bed }} [map legend]<br/>''Note the Marshall Army Airfield below the blue-line Pb marker bed.'' </ref>

==References== {{reflist}}

Category:Permian Kansas Category:Permian geology of Nebraska Category:Stratigraphy of Oklahoma Category:Limestone formations of the United States Category:Building stone Category:Geologic members of the United States Category:Geologic members of Kansas

Fort Riley Limestone

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