Field Notebook: Arizona, Texas. 1923, 1924
Page 69
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
Schizophria striatula, Cetyba reticularis and possibly Pachyphyllum cordorani, The thickness was not determined but seems to be some hundreds of feet thick. Hifn comes in the Mississippian abounding in crinoidal cylinders, as Dr. also saw Rhypidomella trierei and Cysta- crinus (a first surprise). There is probably Pennsylvanian here also. Below all is a vast area of coarse granite that is "Pre-Cambrian" in age, prob- ably Archeozoic. . . It retains many small millstone grits as is so common to granite. It is the same Pre-Cambrian granite seen in the Wetstone Mts. The Babada all along the north side of the Santa Catalina is much dissected and it is still growing. This is in keeping with what I saw on Sunday. Took a sample of the outer Babada material, taken on the Oracle trail side 1/2 way to Tule Ranch.