Alpine, Monday April 5-1926 Started out at 8.15 A.M. for the ammite loc. in the upper Sapbank 5 miles N.E. of Dolfcamp. The [ammitite line] is 60' or below the second thicl limestone gone or about 330 far beneath the tip of the upper Sapbank, but at this place the upper 250 feet are thiner out here present at Dolfcamp. The sec- [illegible] in only as follows. Apparenty eroded away at Dolfcamp Upper thicl Li. 50 furl thicks Dipth Li and Shales about 200' Lower thicl Li 20' Difth Li. and 130' Shales. Have a few fossils found have not seen [illegible] Ammite gone 60 far below the second Li. This ammitite loc. is at base Thicl m Sher. Quadrangle marked 4752 pm Marathon Then started for Sapbank. When out 23.4 miles [illegible] the road one up a hill that has tilted Tsonus helms. Here I saw the same eastward trail that intersected from mile W. of Marathon on the S.P.R.R. The Tsonus here strikes S.60E, and dips 40°S.W. Oradizing the Tsonus is a limestone series that has Lower Sapbank foris