Waterloo Quartzite, Portland quarry ledge, south side of John O'Laughlin's south quarry, showing glaciated angle and surface of quartzite block. Wisconsin, 1903.
Summary
Waterloo Quartzite, Portland quarry ledge, south side of John O'Laughlin's south quarry, showing glaciated angle and surface of quartzite block. Wisconsin, 1903.
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Available in the U.S. Geological Survey Denver Library Photographic Collection, Alden, W.C. Collection.
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