Gaptank Formation

Gaptank Formation
State Texas
Name Gaptank Formation
Geologic age Early; Middle; and Late Pennsylvanian
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mixed-clastic > Sandstone-mudstone (Bed)
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.
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.

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.

NGMDB product
Counties Brewster - Pecos