"King's Geoloyical Map (M.S.) of the Altuda Quadrangle (April 11-1926). Syenite porphyry of Jim Mountain. Accord- ing to the Naden and Potter maps this syenite in one place or another throughout the Marathon region cuts all formations up to the Comanchean inclusive. Therefore is of Post Comanchean age. King's map shows one sed. formation in contact with the syenite other than Quaternary materials - talus and alluvium "wash." To the N. of Jim Mnt, this dike cuts the Leonard, and from the S.W., in the ex- trame W. of the sheet another dike cuts the Leonard. None of these are connected with faults. Therefore these syenite rocks are cleary Post Permian. King distinguishes between a "Lower Pennsylv- anian (= Tensas and Dimple), and an Upper Penn. I believe to be Saptunk)", and says the two series are separated by an "unconformity." Both span below the Leonard of the Permian to the N. and S.W. of Jim Mnt. In this Quadrangle King has no Gulfcamp, or Han, on the terminal Gilliam and Tensas. Leonard Fm. to N. and S.W. of Jim Mnt. ap- pears to then to W. and finally is cut off by a fault 7 miles W. of Jim Mnt. at base of Cathedral Pts. It is again seen 2 1/4 miles W. of Altuda, west of