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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]

H. B. Willman and T. C. Buschbach

Name[edit]

Original description[edit]

The Chana Member of the Pecatonica Formation (Templeton and Willman, 1963, p. 76).

Derivation[edit]

Named for Chana, Ogle County, 9 miles east of the type section.

Other names[edit]

History/background[edit]

Type section[edit]

Type location[edit]

The type section of the Chana Member is located in a ravine (W 1/2 SE SE NE 24, 23N-9E) where it is 6.2 feet thick.

Type author(s)[edit]

Type status[edit]

Reference section[edit]

Reference location[edit]

Reference author(s)[edit]

Reference status[edit]

Stratigraphic relationships[edit]

Extent and thickness[edit]

In the northern outcrop area the Chana Member is commonly less than 5 feet thick, but it reaches 20 feet in southern Illinois.

Lithology[edit]

In the northern area the Chana Member is largely brown, thick-bedded, vuggy, pure dolomite that contains disseminated sand grains and, in places, thin beds of sandstone of the St. Peter texture. The basal part commonly has slightly argillaceous or shaly beds and phosphatic pebbles. In southern Illinois it is largely pure, thick-bedded limestone.

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 TEMPLETON, J. S., and H. B. WILLMAN, 1963, Champlainian Series (Middle Ordovician) in Illinois: Illinois State Geological Survey Bulletin 89, 260 p.

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