July 23, Tuesday, Cumberland, Potto = Potomac section, Maryland. Took the 7 o'clock train for Mrs. King in the B & O. - the lower magnesian - Just at the station we see an iron ore bed of the Clinton which has a thickness of about 10 feet; about one half good iron ore. Beneath is a shale zone of about 4 feet when another ferric iron appears but not a good ore. This zone has a thickness of about 7 feet. Some shale follows. Note how. The iron ore bed has an abundance of Amphibolites and Orthoceras and some Pectycypids. Also many fugeris. In places an abundance of fugeris. These ore beds are not due to subsequent concentration as the ore beds are inter- mittent with shale zones, and sandstone, and are repeat- beds of a transitional character for shales to be beds and iron sands are a return again to shale normal sea. Many of the more heavy beds are cross folded, Passing over a little hollow one comes to the cement mill and continuing southward along the B & O. To more Clinton. The Clinton is separated from the higher Micgiana by double sandstone, the lower one about 2 feet thick, followed by shales and sandstone about 3 feet, and another sandstone about 18 miles thick, other than the sandstone The Clinton fades without change into the higher Michigan and beneath these sandstones about 3 of feet the beds are red and black - same color.