La Porte City Chert - Devonian Subsurface Formation in Central Iowa: Report of Investigations 4, 1967

(1967) La Porte City Chert - Devonian Subsurface Formation in Central Iowa: Report of Investigations 4, 1967. University of Iowa

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Abstract

A study of well samples from central Iowa shows that a distinct rock-stratigraphic unit is present beneath the Devonian Wapsipinicon Formation and above the characteristic dolomites and cherts of the Silurian Niagaran Series. This subsurface unit consists primarily of medium- to dark-gray chert and light-gray limestone. The unit has been traced into southwestern Iowa and its boundaries have been fairly well defined. The name La Porte City Chert, derived from the town of La Porte City in south eastern Blackhawk County, is proposed for this formation. The lithologic characteristics and distribution of the La Porte City Chert in Iowa are shown by graphic well sections and a thickness map.

Item Type: Departmental Report
Keywords: Geology, Mines, Geological Survey, Iowa
Subjects: Natural resources and environment
Natural resources and environment > Earth sciences
Natural resources and environment > Energy resources > Coal
Natural resources and environment > Environmental assessments
ID Code: 25816
Deposited By: Margaret Barr
Deposited On: 05 Dec 2017 17:09
Last Modified: 05 Dec 2017 17:09
URI: http://publications.iowa.gov/id/eprint/25816