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The first detailed map of the Needles area from 1927, published in 1933. The double-dotted line is the road into the Needles; the single-dotted lines are the horse trails. “cccm” stands for Cedar Mesa Sandstone, “ch” for Hermosa Formation, and “cp” for Paradox Formation, “cc” for Cutler Formation. The “U” and “D” refer, respectively, to the horsts and valleys of the Grabens. Arthur A. Baker, Notebooks 1927, volume 100059, U.S. Geological Survey, Denver, Colorado; Arthur A. Baker, “Geology and Oil Possibilities of the Moab District, Grand and San Juan Counties, Utah,” U.S. Geological Survey Bulletin 841 (1933): 1–95.
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