Friday Jan. 15-1926. Today Paul Leashore at 11.30 took me in his car to see some fossil collecting ground. We drove southeast on the Upper Cretaceous along the south side of the Colorado River and at 11 miles from Austin we turned in to the bank of the San Saba which is an exposure of about 35 to 260 feet of the Chisos formation, the base of the Cretaceous. It is all a soft blue clay with no sand rocks although some thin green seams that evidently have more lime than usual. The only fossils that we see readily are Exogyra (12 species) that in about half the cases have thick valves. Found loose in the streambed are large Trifonia and a piece of a radiolite like shell. In the muck lying gone there was an abundance of small things, mostly Hirales with worm tubes of Hamites. The sea bottom was then a soft mud bottom, and I failed to see to what the Exogyra were attached; all appeared to have been tumbled about from their places of attachment, and this took place at any time of life. Just what this very muddy Upper Cretaceous means in regard to the shore and land I cannot make out. I must look into the matter with Lellards.