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Lithostratigraphy
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Chronostratigraphy
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Allostratigraphy
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Hydrostratigraphy
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Primary source[edit]

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)[edit]

M. E. Hopkins and J. A. Simon

Name[edit]

Original description[edit]

The Virgilian Series of the Pennsylvanian System (Moore, 1931, correlation chart).

Derivation[edit]

Named for Virgil, Greenwood County, Kansas, which lies in the outcrop belt of these rocks.

Other names[edit]

History/background[edit]

Type section[edit]

Type location[edit]

Type author(s)[edit]

Type status[edit]

Reference section[edit]

Reference location[edit]

Reference author(s)[edit]

Reference status[edit]

Stratigraphic relationships[edit]

In Illinois it includes all Pennsylvanian strata above a position a few feet below the coal that occurs just below the Shumway Limestone Member (Willman et al., 1967). It thus includes the upper half of the Mattoon Formation of the McLeansboro Group (fig P-2). <center> {| class="wikitable" style="text-align: center;" |- |<gallery caption="" widths=250px heights=250px perrow=4> Figure P-2.jpg|{{file:Figure P-2.jpg}} </gallery> |} </center>

Extent and thickness[edit]

Lithology[edit]

Core(s)[edit]

Photograph(s)[edit]

Contacts[edit]

Well log characteristics[edit]

Fossils[edit]

Where marine rocks are found, as they are in Illinois and the Midcontinent Region, the Virgilian includes strata containing fusulinids of the genus ''Triticites'' that are more advanced than the subgenus ''Kansanella'' found in lower strata. The upper limit is placed just below the first appearance of the Permian genera ''Pseudoschwagerina'' and/or ''Schwagerina'', but neither have been found in the Illinois Basin. The spores and plant-compression fossils in Virgilian rocks are not well known.

Age and correlation[edit]

Environments of deposition[edit]

Economic importance[edit]

Remarks[edit]

Reference(s)[edit]

place a <pre><br></pre>at the end of a line to get a line return MOORE, R. C., 1931, Pennsylvanian cycles in the northern Midcontinent region: Illinois State Geological Survey Bulletin 60, p. 247-257.<br> WILLMAN, H. B., et al., 1967, Geologic map of Illinois: Illinois State Geological Survey.

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