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Twin Buttes, Harper Co., Oklahoma, USAi
Regional Level Types
Twin Buttes- not defined -
Harper Co.County

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Latitude & Longitude (WGS84): 36° 56' 19'' North , 99° 56' 46'' West
Latitude & Longitude (decimal): 36.93878,-99.94637
GeoHash:G#: 9y8fjst20
Köppen climate type:BSk : Cold semi-arid (steppe) climate
Nearest Settlements:
Laverne1,365 (2017)25.9km
Buffalo1,311 (2017)30.3km
Ashland816 (2017)32.1km

An occurrence located 8 miles N of Rosston and 1 mile E of US highway 283, halfway up the north butte.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

2 valid minerals.

Detailed Mineral List:

Formula: CaCO3
Reference: R&M 72:4 pp 252-264
Formula: CaCO3
Reference: R&M 72:4 pp 252-264

List of minerals arranged by Strunz 10th Edition classification

Group 5 - Nitrates and Carbonates

List of minerals arranged by Dana 8th Edition classification

Unclassified Minerals, Mixtures, etc.

List of minerals for each chemical element

C AragoniteCaCO3
C CalciteCaCO3
O AragoniteCaCO3
O CalciteCaCO3
Ca AragoniteCaCO3
Ca CalciteCaCO3

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

251.902 - 298.9 Ma

ID: 2907101
Marlow Formation

Age: Phanerozoic (251.902 - 298.9 Ma)

Stratigraphic Name: Marlow Formation

Description: WOODWARD- Orange-brown fine-grained sandstone and siltstone, with some interbedded red-brown shale and silty shale in upper part and some thin gypsum beds at base, about 35 feet above base, and at top. The upper two gypsum and (or) dolomite beds are generally pink to maroon and less than 1 foot thick; they may erode into mappable escarpments about 20 feet apart, being named "Emanuel Bed" at top (mapped) and "Relay Creek Bed" 15 to 20 feet below the top (not mapped). In places the basal Marlow is a greenish-gray medium-grained sandstone. In Woods and Woodward Counties, the "Doe Creek Lentil" (Pmd) is a coarse-grained calcareous sandstone with algal clumps and invertebrate fossils, ranging up to 70 feet thick from the base of the Marlow to the Relay Creek Bed, cropping out in a narrow band of high hills striking northeast. Thickness is about 120 feet, with top eroded at many places. CLINTON- "Marlow Formation," Pm, orange-brown, fine-grained sandstone and siltstone, about 100 to 130 feet thick, thinning northward. This formation has 2 gypsum and (or) dolomite beds in upper 20 feet--the "Emanuel Bed" (at top) and the "Relay Creek Bed" (20 feet below top). Two thin, pale shales occur; the first is 1 foot below the top ("Gracemont") and the second is 55 feet above the base (unnamed). OKLAHOMA CITY- Mostly orange-brown fine-grained gypsiferous sandstone, with some red-brown shale. Contains 10 feet of calcitic sandstone lenses near middle and 2 thin dolomites (or gypsums) at top. Exposed thickness, about 50 feet (top 50 to 75 feet eroded). (Whitehorse Group) LAWTON- "Marlow Formation," Pm, very fine-grained sandstone with some silty shale; thickness, about 90 to 130 feet (27 to 40 m); contains 2 thin gypsum and (or) dolomite beds in upper 20 feet (6 m)-the "Emanuel Bed" (at top) and the "Relay Creek Bed" (20 feet below top). (Whitehorse Group) ARDMORE-SHERMAN- Sandstone, orange-brown, fine- to medium-grained, moderately indurated, with "Verden Sandstone Lentil," Pmv, 10 feet thick near middle, and "Relay Creek" and "Emanuel" dolomite and gypsum beds at top; thickness, 105 to 135 feet (Whitehorse Group).

Comments: Original map source: Heran, W.D., Green, G. and Stoeser, D.B., 2003, A Digital Geologic Map Database of Oklahoma: USGS Open File Report 03-247, scale 1:250,000.

Lithology: Major:{sandstone,siltstone}, Minor:{shale}, Incidental:{gypsum, dolostone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

251.902 - 541 Ma

ID: 3187973
Paleozoic sedimentary rocks

Age: Phanerozoic (251.902 - 541 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License


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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Rocks & Minerals (1997): 72(4): 252-264.

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