Dockum Group (OKTRd;0)

State	Oklahoma
Name	Dockum Group
Geologic age	Phanerozoic \| Mesozoic \| Triassic-Late
Original map label	TRd
Primary rock type	shale
Secondary rock type	siltstone
Other rock types	conglomerate; sandstone; limestone
Lithologic constituents	Major Sedimentary > Carbonate > Limestone (Bed) Sedimentary > Clastic > Conglomerate (Bed) Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Clastic > Siltstone (Bed) Minor Sedimentary > Clastic > Mudstone > Shale (Bed) Sedimentary > Clastic > Mudstone (Bed)
Map references	Heran, W. D., Green, G. and Stoeser, D. B., 2003, A Digital Geologic Map Database of Oklahoma: U. S. G. S. Open File Report 03-247
Unit references	Heran, W. D., Green, G. and Stoeser, D. B., 2003, A Digital Geologic Map Database of Oklahoma: U. S. G. S. Open File Report 03-247 Sapik, D.B. and Goemaat, R.L., 1973, Reconnaissance of the ground-water resources of Cimarron County, Oklahoma: U.S Geological Survey Hydrologic Investigations Atlas HA-373, scale 1:125,000, 3 sheets. (Geology on sheet 1 compiled by S.L. Schoff, 1943.) [http://pubs.er.usgs.gov/publication/ha373] Cederstrand, J.R., 1996c, Digital geologic map of Cimarron County, Oklahoma: U.S. Geological Survey Open-File Report 96-372, (1 diskette), URL address is: http://ok.water.usgs.gov/gis/geology [http://pubs.er.usgs.gov/publication/ofr96372] [http://ok.water.usgs.gov/gis/geology]
Geographic coverage	Cimarron