Ref.: Bayley, R. W. (1959) "Geology of the Lake Mary Quadrangle, Iron County, Michigan." U. S. Geological Survey Bulletin 1077, U. S. Government Printing Office, Washington, p. 67 - 75.
Outcrops of a huge sill of differentiated metagabbro intruded into the strata of the Hemlock Volcanics formation. The sill stretches for about 13 miles northeast-southwest, and is about three miles across its widest exposure.
The subject outcrops are located in NE/4 Sec 17 T43N R31W and NW/4 Sec 12 T43N R32W.
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Map Reference: 46°7'36"N , 88°12'19"W
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