Markley Formation

Markley Formation
State Texas
Name Markley Formation
Geologic age Pennsylvanian to Early Permian
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Minor
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
Incidental
Sedimentary > Carbonate > Limestone (Bed)Crystal Falls Limestone in so. Young Co, 1-2 ft in discontinuous otcps.
Sedimentary > Coal > Sub-bituminous (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Comments Overlies Canyon Grp. Basal formation of Bowie Group (new), Hentz (1988). Continental and minor paralic strata on Bend arch and Ft Worth syncline (Young, Jack, Clay, Montague Cos., TX) Sandst., mudst., conglomerate, coal, scarce thin limest. Easternmost outcrop, fluvial and minor fluvial-deltaic sandst. and chert-pebbly conglomerates form marker beds. Markley contains 15 sandst. members which occur as mappable stacked bodies and horizontally contiguous belts, separated by thin mudstone zones. Mudst. contains sandst. and siltst. lentils and discontinuous seams of subbituminous coal and carbonaceous shale (Newcastle Coal and others). In lower part are thin beds of weathered and fissile subbituminous coal. Ranges in thickness 320-600 ft.
Stratigraphic units Cisco Group, Bowie Group (new),Virgil Series, Newcastle Coal, Crystal Falls Limestone
References

Bureau of Economic Geology, 1987, Wichita Falls-Lawton Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.

Hentz, T., 1988, Lithostratigraphy and paleoenvironments of upper Paleozoic continental red beds, north-central Texas: Bowie (new) and Wichita (revised) Groups: Texas Bureau of Economic Geology, Report of Investigations 170.

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 Archer - Clay - Culberson - Jack - Montague - Throckmorton - Wise - Young