Kaskaskia Sequence

(Redirected from 4000)
Jump to navigation Jump to search

Chronostratigraphy: Paleozoic Erathem >>Devonian System >>Middle Devonian Series >>Upper Devonian Series
Allostratigraphy: Kaskaskia Sequence

Primary source

Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.

Contributing author(s)

Charles Collinson and Elwood Atherton


Original description


The Kaskaskia Sequence is named for the Kaskaskia River in south-central Illinois.

Other names


Type section

Type location

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The major unconformity at the base of the Middle Devonian Series, or in some areas the base of the Upper Devonian Series, is widely present throughout the eastern part of the United States, and the strata between the unconformity and the next higher major unconformity (which in Illinois is at the base of the Pennsylvanian System) are called the Kaskaskia Sequence (Sloss et al., 1949) (fig. 14). The original definition of the sequence placed its top at the base of the Mississippian Aux Vases Sandstone, excluding the Chesterian Series. However, because the sub-Aux Vases unconformity is confined to the margin of the basin and the Chesterian strata generally have the same structural attitude as the underlying Valmeyeran Series, the Kaskaskia was extended upward to the base of the Pennsylvanian System (Swann and Willman, 1961).

Extent and thickness





Well log characteristics


Age and correlation

Environments of deposition

Economic importance



SLOSS, L. L., W. C. KRUMBEIN, and E. C. DAPPLES, 1949, Integrated facies analysis, in Sedimentary facies in geologic history: Geological Society of America Memoir 39, p. 91-123.
SWANN, D. H., and H. B. WILLMAN, 1961, Megagroups in Illinois: American Association of Petroleum Geologists Bulletin, v. 45, p. 471-483; Illinois State Geological Survey Reprint 1961-N.

ISGS Codes

Stratigraphic Code Geo Unit Designation