Nancy Clayton was a geology professor at SRSU in the 1970s.
The Archives of the Big Bend has a brief biographical file on Nancy Clayton in the Sul Ross State University Collection that includes the following:
She is listed as an instructor of geology in the 1975-1977 SRSU Bulletin. There is a photograph of her in the 1977 Brand yearbook, page 32. A mention of her as a member of the geology faculty appears in the Clifford B. Casey collection, and Casey's Sul Ross State University book (page 250).
WorldCat lists a 1975 thesis, Land Use Planning: Dinosaur Mountain Area, Pinal County, Arizona. From Arizona State Univ.
The Library's front desk has a copy of Clayon's thesis.