Skip to main content

Gaptank Formation

Gaptank Formation
State Texas
Name Gaptank Formation
Geologic age Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early Pennsylvanian-Middle Pennsylvanian-Late
Comments (fr. Fort Stockton Sheet, Geol. Atlas of Texas, 1982) upper 800 ft thick layers of limestone interbedded with sandst. and shale, followed downward by 900 ft of interbedded sandst., shale, and coarse conglomerate and a basal 100-ft-thick fossiliferous limestone; thickness of formation 1,800 ft.
Primary rock type fine-grained mixed clastic
Secondary rock type limestone
Other rock types conglomerate
Lithologic constituents
Sedimentary > Clastic > Mixed-clastic > Sandstone-Mudstone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Map references
Bureau of Economic Geology, 1992, Geologic Map of Texas: University of Texas at Austin, Virgil E. Barnes, project supervisor, Hartmann, B.M. and Scranton, D.F., cartography, scale 1:500,000
Unit references
Plummer, F.B., and Moore, R.C., 1921, Stratigraphy of the Pennsylvanian formations of north-central Texas: University of Texas Bulletin 2132.
Ross, C.A., 1952, The Wolfcamp Series (Permian) and new species of fusulinids, Glass Mountains, Texas: Journal of the Washington Academy of Sciences, v. 49, no. 9, p. 299-316.
Bureau of Economic Geology, 1982, Fort Stockton Sheet, Geologic Atlas of Texas, University of Texas at Austin, scale 1:250,000.
Cooper, G.A., and Grant, R.E, 1972, Permian brachipods of West Texas, I, in Smithsonian Contributions to Paleobiology no. 14.
Counties Brewster - Pecos