. Bulletin of the Geological Society of America. Geology. Figure 1.—Slate Quaray at Thomson, Minnesota. Figured2.—Shattered Surface or Graywacke and Graywacke Slate, Thomson, Minnesota SLATE QUARRY AND GRAYV/ACKE EXPOSURE. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890