At 2 P.M. left Outum creek and at 4.10 pitched camp on Rock Creek about one mile from the new S.P. R.R. cut-off. Distance about 6 miles. On our way to this camp for the last two miles we came down the valley of Rock Creek. The valley is several miles wide and in one place have layers of sandstone are seen on both sides of the valley dipping in opposite directions. Rock Creek therefore has cut its valley down through the apex of the anticlinal with the beds dipping S. R. more S. Dip apparently 20 to 30. After arriving in camp walked S.E. up over the valley ridge from camp and came across three outcrops of sandstone. The first one is about 3/4 mile away and stands out in two mounds of iron-stained sandstone. In this I noticed casts of a very large Anomuros and one of the