This rock angle or headland 1 mile below them - Big Bank and Deep Water. M curve = 15 ft exposed, and no question why a cement durable thickness is left below water level. Vanceburg ferry landing, M curve 17 ft thick line, nearly horizontal. Going up stream, the brecciated appearance is common again, especially in certain layers, while in the bedded rocks lack the brecciation. Why? Large chert masses, like concrete, about 3 x 4 x 3 ft in different diameters, some in place & one from loose. These large concrete massy masses are especi ally abundant at my first on about 8 feet below the top of the M curve. A quarter of a mile up stream from the ferry landing there is a continuous chert layer in the M curve, from 2 to 3 feet thick, about 4½ feet below the top of the M curve. Could the growth of these cherts have been the cause of the brecciation? Going up stream, the top of the M curve slowly approaches river level, at the upper landing for boats at the upper end of Vanceburg the top of the M curve is 15 ft above river level. Apparently different sets from the top of the M curve at different places. Three quarters up stream meeting three fourths down stream. No exposure up river from this land- ing in the river edge beyond ½ mile. Sandy Springs, opposite Vanceburg, along river road to Gilpin Run. No exposures, just NW of Gilpin Run Bench Mark, 579 ft above sea. Bench Mark, Black shale is exposed as low as 575 US GS. This is not the face of the Black shale. Little Sulphur Creek, crossing. Sully crossing. Black shale < 540 US GS. 6½ ft blue clay shale with thin black shale at couple levels. 1 inch very lithuminous lens - tree trunk 4 inches 1½ ft black shale interbedded in blue clay shale 2 ft blue clay shale. < 530 Sulphur Creek, just S of road crossing, Top of M curve = 495 exact. Strike almost N+S, Dip rather steep easter at least 10 degrees. A short distance up the creek, at school, the thick greenish clay shale section