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Publication Extents

Not all publications have extents, not all extents are completely accurate
The gold quartz veins of Grass Valley, California
W. D. Johnston Jr.
1940, Professional Paper 194
The gold quartz veins in the vicinity of Grass Valley, Calif., have been actively mined since the fifties of the nineteenth century. Lindgren mapped the areal geology and studied the mines of the district in 1894, and the accompanying geologic map (pl. 1) is reproduced from his reports. Since then...
Stratigraphic measurements in parallel folds
J.B. Mertie Jr.
1940, Geological Society of America Bulletin (51) 1107-1134
Folded rocks having bedding surfaces which are approximately parallel are said to lie in parallel folds. Utilizing the principle of evolutes and involutes, the author offers a more precise definition of parallel folds and points out inconsistencies in other concepts. With the idea of classifying parallel folds and possibly of...