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The Silurian reef at Thornton, Illinois

Donald G. Mikulic
Donald G. Mikulic
Illinois State Geological Survey, 615 E. Peabody Drive, Champaign, Illinois 61820
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January 01, 1987


The Thornton Reef is exposed in quarries owned by the Material Service Corporation and in roadcuts along 1-80 and 1-294, about 4.8mi(8km) west of the Illinois-Indiana boundary (Figs. 1 and 2), in the W¼,Sec.27,N¼Sec.33,T.36N.,R.13E,Harvey and Calumet City 7¼-minute Quadrangles, Thornton, Cook County, Illinois.

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Figures & Tables


DNAG, Centennial Field Guides

North-Central Section of the Geological Society of America

Donald L. Biggs
Donald L. Biggs
531 Hayward Avenue Ames, Iowa 50010
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Geological Society of America
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Publication date:
January 01, 1987




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