"sutilita, Spirifer cameratus (large and typical) S. fragmantanus (rare), Productus cca, P. semineticulatus, P. iredsi, P. neharlensis P. (ribbed form), Derby crenata, Hosteldia mormoni, Chaetes rudicaria, Japhrentes sp. This is the typical middle Pennsylvanian assemblage. Then a 70 mile drive up the San Pedro valley through deeply dissected trams, with the Lara Balliario RR to the park. Finally to Oracle and Tucson. The granite all about Oracle is not post Carboniferous but is pre-Cambrian. Rising out of the San Pedro valley are one or two granitic ridges if the granites seen all about Oracle. Miles and miles of aridose gravel can't be seen here. In this connection study the Slate Folios (III), (Rog Folio 1924 onw out), and Ransom Prof. Paper 98 K (1916) "Some Pal. Sections in Arizona ad Their Correlation"