Page 171 - Walks In The Black Range
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The Hillsboro Quadrangle Geologic Map, including such things as the description of map units found above was produced by the State of New Mexico Bureau of Geology and Mineral Resources and can be downloaded at the preceding link. A report accompanies the geologic map and it may be downloaded here. See The Black Range Naturalist, Volume 2, Number 4 for a description of other geologic maps covering the Black Range.
