The tilted, Mesoproterozoic Mescal Limestone forms the dam abutment at Roosevelt Lake. See also: www.azgs.az.gov/publications_online/bulletins/bull184.pdf for an interesting photo from a similar viewpoint, taken before the dam height was raised.
Photographer: Esty Pape
Photo Date: 2013
Photo Location Accuracy: Known Location
Photo Tags: Roosevelt Dam, Roosevelt Lake, Mescal Limestone, Mesoproterozoic, abutment 
