Page 7 - Black Range Naturalist, Vol. 2, No. 4
P. 7

 Immediately to the east of the Hillsboro Quadrangle lies the maps. Although the areas are adjacent to each other, their Skute Stone Arroyo 7.5-minute Quadrangle. The geologic geology is very different.
map of this quadrangle is shown below (download map).
Note how quickly the landform changes between the two
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