Tucson, Arizona, Feb 23 1950 At 8 A.M I am off in R.F. Ibarrones car for the Chetstone Mts. The party consists of Prof. Stegmow, Ibarrone and C.E. Gooddell It is about 70 miles to about the center of the Chetstone Mts. The place is the same one I visited last year with Stegmow, Lawson and Ramsome. We collected most of the time in the uppermost Cambrian. Large Hyolithes are common with a large Cepicethalus and other trilobites. The horizon looks to me to be Carbonian like that of Llano, Texas. Or Ordovician here. Within 20 feet of the Cambrian collected is comes the Devonian. The basal ten feet is a dolomite or a highly magnesian li. in which away are the fossils are illiterated. Stromatopora that I like Cryptogron are not common. The Cladifera and a small grigid coral that is pretty and for mossits.