Palzo Sandstone Member (abandoned)

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Lithostratigraphy: Carbondale Formation >>Palzo Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence

Primary source

Nelson, W.J., P.H. Heckel and J.M. Obrad, 2022, Pennsylvanian Subsystem in Illinois: Illinois State Geological Survey, Bulletin (in press).

Contributing author(s)

W.J. Nelson


Original description

This name was used first in passing by Cady (1942, p. 9) and in a footnote by Weller et al. (1942).


The Palzo Sandstone was named for an unincorporated community in Williamson County, southern Illinois.

Other names


Type section

Type location

Wanless (1956) listed, but did not describe, the type section as located near the village of Palzo (SE¼ sec. 16, T 10 S, R 4 E).

Type author(s)

Wanless (1956).

Type status


Reference section


Stratigraphic relationships

Willman et al. (1975) positioned the Palzo Sandstone beneath the Colchester Coal and overlying the Davis, Dekoven, and Seelyville Coals. These authors stated that the Palzo is the same as the Isabel and Sebree Sandstones. However, the Isabel lies below the Abingdon Coal and thus is older than the Palzo. In this report, the Palzo Sandstone is recognized as being identical to the Coxville Sandstone. Because the name Coxville has priority, the name Palzo Sandstone is hereby abandoned.


  • Cady, G.H., 1942, Analyses of Illinois coals: U.S. Bureau of Mines, Technical Paper 641, 245 p.
  • Wanless, H.R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey, Circular 217, 14 p.
  • Weller, J.M., H.R. Wanless, L.M. Cline, and D.G. Stookey, 1942, Interbasin Pennsylvanian correlations, Illinois and Iowa: American Association of Petroleum Geologists Bulletin, v. 26, p. 1585–1593.
  • Willman, H.B., E. Atherton, T.C. Buschbach, C. Collinson, J.C. Frye, M.E. Hopkins, J.A. Lineback, and J.A. Simon, 1975, Handbook of Illinois stratigraphy: Illinois State Geological Survey, Bulletin 95, 261 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation