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folding, faulting, and brecciation, 2

image

detail (minus border rule, etc) of Plate xxiv,
Jaspilite from Grand Rapids Mine, Negaunee
illustrating Charles Richard Van Hise (1857-1918 *) and William Shirley Bayley (1861-1943). The Marquette iron-bearing district of Michigan, with atlas. Including a chapter on the Republic Trough, by Henry Lloyd Smith. Department of the Interior. Monographs of the U.S. Geological Survey. XXVIII. 1897.
*
The "two emphatic intrusions" found in the monochrome Google scan (of copy at Stanford University) were evidently a tear in the, or loose scrap of, paper. This poor snapshot of an original copy (at Harvard's Cabot Science Library) can only hint at the beauty — uniformly so — of the plates in this volume. The two presentations are incomparable and striking in their respective ways.

Google scans of copies at Cornell* and Purdue* are also available. The Stanford and Cornell scans are at least partly in color (but no color for Plate xxiv); the Purdue scan misses Plate xxiv.
 

original post
tags: C. R. Van Hise; W. S. Bayley; brecciation; emphatic intrusions; iron; iron-bearing districts; jaspalite; variorum