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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 | edit 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)[edit | edit source]

M. E. Hopkins and J. A. Simon

Name[edit | edit source]

Original description[edit | edit source]

The Morrowan Series of the Pennsylvanian System (Adams, 1904, p. 28).

Derivation[edit | edit source]

Named for Morrow, Washington County, Arkansas.

Other names[edit | edit source]

History/background[edit | edit source]

Type section[edit | edit source]

Type location[edit | edit source]

The type exposure on Hale Mountain lies a short distance from Morrow, Arkansas.

Type author(s)[edit | edit source]

Type status[edit | edit source]

Reference section[edit | edit source]

Reference location[edit | edit source]

Reference author(s)[edit | edit source]

Reference status[edit | edit source]

Stratigraphic relationships[edit | edit source]

The Caseyville Formation of the McCormick Group (fig. P-2) constitutes the entire Morrowan Series in Illinois (Willman et al., 1967). The top of the series may not correlate precisely with the top in the Midcontinent section. <center> {| class="wikitable" style="text-align: center;" |- |<gallery widths=250px heights=250px perrow=4> Figure P-2.jpg|{{file:Figure P-2.jpg}} </gallery> |} </center>

Extent and thickness[edit | edit source]

Lithology[edit | edit source]

The series consists of marine and nonmarine rocks.

Core(s)[edit | edit source]

Photograph(s)[edit | edit source]

Contacts[edit | edit source]

Well log characteristics[edit | edit source]

Fossils[edit | edit source]

Marine fossils are rare in the Caseyville, but the Sellers Limestone Member in southeastern Illinois contains a Morrowan fauna. The type region of the Morrowan in many places contains ''Millerella'', a nonfusiform fusulinid that is also found in the Chesterian Series and in younger Pennsylvanian sediments and is the most advanced fusulinid found in Morrowan rocks. However, no fusulinids have been found in the Illinois Morrowan. The upper limit of the Morrowan in fusulinid-bearing rocks is placed at the base of the first strata containing ''Profusulinella''. <br> The compression plant fossils of the Morrowan Series are in Zone 6 (''Neuropteris tennesseeana'' and ''Mariopteris pygmaea'') of Read and Mamay (1964). The roof shale of the Baldwin coal, which occurs in the Morrowan type section, contains a plant-impression flora similar to that above the Gentry Coal Member in southeastern Illinois. The relative ages of strata within the Morrowan Series in Illinois can best be determined from the spores, which are abundant in Caseyville sediments, especially the coals. The Morrowan Series in Illinois is dominated by the genus ''Lycospora'', which in some coals makes up as much as 80 percent of the spore population. Spores of herbaceous lycopods -- Densosporites, Cristatisporites , and Radiizonates -- are also abundant. ''D. sinosus, R. striatus'', and ''R. irregularis'' are useful guide fossils for the lower part of the Morrowan, whereas ''C. indignibundus'' is typically found in the upper part. ''Schulzospora'' ranges up to the top of the Morrowan. ''Triquitrites'', ''Laevigatosporites'', and ''Endosporites'' are found in the lower part of the Morrowan but are very rare.

Age and correlation[edit | edit source]

Environments of deposition[edit | edit source]

Economic importance[edit | edit source]

Remarks[edit | edit source]

Reference(s)[edit | edit source]

place a <pre><br></pre>at the end of a line to get a line return ADAMS, G. I., 1904, Zinc and lead deposits of northern Arkansas: USGS Professional Paper 24, 118 p.<br> READ, C. B., and S. H. MAMAY, 1964, Upper Paleozoic floral zones and floral provinces of the United States: USGS Professional Paper 454-K, p. K1-K35.<br> WILLMAN, H. B., et al., 1967, Geologic map of Illinois: Illinois State Geological Survey.

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