Edit a page: Montrose Chert 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)

Elwood Atherton, Charles Collinson, and Jerry A. Lineback

Name

Original description

The Montrose Chert Member of the Keokuk Formation (Keyes, 1895, p. 320).

Derivation

Named for Montrose, Lee County, Iowa.

Other names

===History/background=== Earlier, these beds had been termed the "Keokuk cherty limestones" (Owen, 1852) or the "cherty beds of passage" separating the Keokuk and Burlington (Hall, 1857). ==Type section== ===Type location=== The type section of the Montrose Chert Member consists of 30 feet of very cherty limestone at the base of the Keokuk Limestone where it is exposed along the Mississippi River between Montrose and Keokuk. ===Type author(s)=== ===Type status=== ==Reference section== ===Reference location=== ===Reference author(s)=== ===Reference status=== ==Stratigraphic relationships== ==Extent and thickness== The Montrose Chert Member is generally about 30 feet thick and consists of gray, medium- to coarse-grained, fossiliferous limestone and light gray dolomite in beds 2-10 inches thick. ==Lithology== The Montrose Chert Member contains nodules and beds of blue-gray chert. The chert is dominant in many places and commonly is strongly brecciated (Collinson, 1964). ==Core(s)== ==Photograph(s)== ==Contacts== ==Well log characteristics== ==Fossils== ==Age and correlation== ==Environments of deposition== ==Economic importance== ==Remarks== ==References== COLLINSON, CHARLES, 1964, Western Illinois: 28th Annual Tri-State Field Conference, Quincy, Illinois, Illinois State Geological Survey Guidebook Series 6, 30 p.<br> HALL, JAMES, 1857, Observations upon the Carboniferous limestones of the Mississippi Valley (abstract): American Journal of Science, v. 23, p. 187-203.<br> KEYES, C. R., 1895, Geology of Lee County: Iowa Geological Survey, v. 3, p. 305-407.<br> OWEN, D. D., 1852, Report of a geological survey of Wisconsin, Iowa, and Minnesota and incidentally of a portion of Nebraska Territory: Philadelphia, 638 p. {{Codes |membercode=5355 |geo_unit=-- }}

History/background

Type section

Type location

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

Extent and thickness

Lithology

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

Membercode:
Geo_unit:
Geo_image:	Upload file

Summary:

This is a minor edit

Watch this page

Cancel