Page:Field Notes of Junius Henderson, Notebook 2.pdf/89

 hogback series. Dip E 25˚. Same ditch reemerges from tunnel in a black shale sandy band which is probably the cause of the tendency of basal Dakota  to separate into two benches. No conglomerate here. Shale about 20 ft. thick – contains lots of vegetable fragments carbonized. On S side big ditch it cuts through entire Dakota, making a fine exposure. Low in the shales, below middle, find the same fossils as further south. Due E is a fine fold in Niobrara. Reached at 1:30 and shipped a big box of fossils. Measured Jurassic section at last canyon visited, as follows, generalized: