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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]

T. C. Buschbach

Name[edit]

Original description[edit]

Franconian Stage (Howell et al., 1944, chart 1).

Derivation[edit]

Other names[edit]

History/background[edit]

Type section[edit]

Type location[edit]

The type section of the Franconian Stage is based on the type section of the Franconia Formation at Franconia, Chisago County, Minnesota.

Type author(s)[edit]

Type status[edit]

Reference section[edit]

Reference location[edit]

Reference author(s)[edit]

Reference status[edit]

Stratigraphic relationships[edit]

The Franconian Stage includes the strata from the ''Elvinia'' Zone (at the base) to the top of the ''Dikelocephalus postrectus'' Zone. Some stratigraphers prefer to place the top of the stage lower in the Franconia, at the top of the ''Ptychaspis-Prosaukia'' Zone of Bell et al. (1956)-- the ''Prosaukia'' Zone of Lochman-Balk and Wilson (1958). These faunal zones have not been differentiated in Illinois, but the Ironton and Franconia Formations are at least approximately equivalent to the type Franconia Formation and are included in the Franconian Stage.

Extent and thickness[edit]

Lithology[edit]

Core(s)[edit]

Photograph(s)[edit]

Contacts[edit]

Well log characteristics[edit]

Fossils[edit]

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 BELL, W. C., R. R. BERG, and C. A. NELSON, 1956, Croixan type area-upper Mississippi Valley, ''in'' El Sistema Cambrico, su paleogeografia y el problema de su base-symposium, Part 2: 20th International Geological Congress, p. 415-446.<br> HOWELL, B. F., et al., 1944, Correlation of the Cambrian formations of North America: Geological Society of America Bulletin, v. 55, p. 993-1003.<br> LOCHMAN-BALK, CHRISTINA, and J. L. WILSON, 1958, Cambrian biostratigraphy in North America: Journal of Paleotology, v. 32, p. 312-350.

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