The first comprehensive paper on the stratigraphy of the Van Horn area was written by G. B. Richardson and published by the United States Geological Survey.3 In this paper Richardson very clearly presents the regional structural and stratigraphic features of the Sierra Diablo, which he states on page 5 to be composed entirely of Hueco limestone north of Victorio Peak. The Hueco limestone, assigned by G. H. Girty to the Pennsylvanian, was shown by Richardson to be lying with great unconformity on the older rocks at the south end of the Sierra Diablo. Later work by Emil Böse4...
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