Lake Michigan's Coral

Lake Michigan's water level was uncommonly low last week. Trooping along the shore near Chicago, a bevy of geology students from Central Y. M. C. A. College of Arts & Science were so surprised to see parts of a submerged reef well known to chartmakers jutting a few inches above water that they waded out to chip off samples. When they brought back their specimens to Instructor James H. Glasgow, University of Chicago graduate student, he stared at the stuff, decided it was white coral, sent it to university geologists who confirmed his opinion. Divers were sent to survey Lake Michigan's coral reef. It parallels the shore for 1,500 ft., is flat on top, evidently shaved off by Pleistocene glaciers. Mr. Glasgow ascribed it to the Silurian period--400,000,000 years ago. At that time the U. S. Midwest was covered by a broad bay of the ocean reaching up from what is now Central America, as numberless marine fossils found in the region testify. Lake Michigan's coral is the farthest north ever found.

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