Edit a page: Coggan Member

You do not have permission to edit this page, for the following reason:

The action you have requested is limited to users in the group: Users.

For Help in formatting please see the Wiki Help

Categories:
	1:	2:
	3:	4:
	5:	6:
	7:	8:
	9:	10:

Lithostratigraphy
	1:	2:
	3:	4:
	5:	6:
	7:	8:
	9:	10:

Chronostratigraphy
	1:	2:
	3:	4:
	5:	6:
	7:	8:
	9:	10:

Allostratigraphy
	1:	2:
	3:	4:
	5:	6:
	7:	8:
	9:	10:

Hydrostratigraphy
	1:	2:
	3:	4:
	5:	6:
	7:	8:
	9:	10:

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

Name

Original description

The Coggan Member of the Wapsipinicon Limestone (Norton, 1894, p. 23-24).

Derivation

Named for Coggan, Linn County, Iowa.

Other names

History/background

Type section

Type location

The type section of the Coggan Member is at the Illinois Central Railroad crossing of the Buffalo River near Coggan, Linn County, Iowa.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Coggan Member is at the base of the Wapsipinicon Limestone in Illinois.

Extent and thickness

The Coggan Member is not exposed in Illinois, but it occurs locally in subsurface and is as much as 20 feet thick in the area between Galesburg, Knox County, and Muscatine, Iowa.

Lithology

The Coggan Member consists of massive, buff, cherty dolomite. It also contains a thin bentonite that has been correlated with the Tioga Bentonite Bed, which occurs near the top of the Grand Tower Formation southeast of the Sangamon Arch.

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

Age and correlation

Environments of deposition

Economic importance

Remarks

Reference(s)

place a <pre><br></pre>at the end of a line to get a line return NORTON, W. H., 1894, Notes on the lower strata of the Devonian Series in eastern Iowa: Iowa Academy of Science Proceedings 1, part 4, p. 22-24.

Membercode:
Geo_unit:
Geo_image:	Upload file

Summary:

This is a minor edit

Watch this page

Cancel