Thursday, Tucson, Arizona April 2, 1925. At eleven in the morning Stroganov, Jetta and Schueber are off for a rapid trip north to the Grand Canyon of the Colorado. We have a loan of Arizona Dodge car, and Stalle along all of my passage. Had lunch and at 12.45 we are off by way of Oracle and then down into the San Pedro valley at Mammoth. Then down north the valley to (at 3.20 P.M.) Feldman and Grindelmann where the San Pedro flows into the Gila. To the south of the river are the Balliara Mts, mainly of igneous rocks and a big Pennsylvanian section - Affu Tornado. At Grindelmann we go N.E. through the gorge of the Gila that cuts through the Dripping Spring Mts. Here are wonderfully well exposed the beds of the Tornado formation of Rousonce. The structure is a syncline and an arch. About 1½ miles N.E. of Grindelmann in sandy facings of a cherty li. I collected and turned out to Stroganov Fiedelina (the Balliara fauna), Eupachyceramus plate (with much acen and high tuberculate), Spirifer grodymutana (Spiriferina - Kentuckiensis, S. spinosa (there left the first specimen), Composita satellita, Austroedia mormoni (maybe for fines plate), and Diclasma