Unknown (in Swift Creek area)

WYO GEOL SURV OPEN FILESOsterwald and others, 1966, WGS Bull. 50, p. 148.Mansfield, 1916, A reconnaissance for phosphate in the Salt River Range, Wyoming: USGS Bull. 620-O, p. 331-349, pl. XII.KIVI, W.J., 1940, STRATIGRAPY OF PHOSPHORIA FORMATION OF WESTERN WYO. WITH NOTES ON OCCURENCE OF PHOSPHATE: University of Wyoming, UNPUBLISHED M.A. THESIS, 59 p.McKelvey, V.E., 1946, Preliminary report on the stratigraphy of the phasphatic shale memnber of the Phosphoria Formation in western Wyoming, southesastern Idaho, and northern Utah: USGS OFR 47-2, p. 96-103. [available at http://pubs.er.usgs.gov/usgspubs/ofr/ofr472]