English: Phyllite of Poorman Formation near Homestake Mine, truck rt. 85 near Lead, South Dakota. Collected June 8, 1997 during Penn State's Geology Field Camp. Collection designation is hs1. The Poorman Formation was first named in:
Hosted, J. O., and Wright, L. B., 1923, Geology of the Homestake ore bodies and the Lead area of South Dakota: Engineering and Mining Journal, v. 115, p. 793-799, 836-843.
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