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A Late Silurian circular coral-strome patch reef just south of Chicago.

The surrounding water was about 200 feet deep.

Silurian

Page 27

Thornton Reef

Images modified from J.J.C. Ingels, Geometry, paleontology, and petrography of Thornton Reef Complex, Silurian of northeastern Illinois, AAPG Bulletin; March 1963; v. 47; no. 3; p. 405-440.

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