Thedford, July 27-1912 Saturday. Williams wanted me to show him over the Hamilton about Thedford-Arlima as he is to be the guide for the Geological Congress here next year. He left Crilington at 6.30 A.M., changed to the main line at Georgetown and arrived at Thedford at 3.45 P.M. Stopping at the Armill House the same hotel Mrs. at m 1895 when collected material for the U.S. National Museum. At Terra Otta which is about ten miles north of Georgetown the land is much exposed and full of clay. There is a tile factory here using a red shale and here and there a thin green band. This red shale forma- tion is at least 100 hundred feet thick and must be more other than the top of the Richmond series. If or this evidence is interesting because it seemingly much correspond with the brick red shales at Hamilton underneath the so-called Clinton-Oneida