Page:Field Notes of Junius Henderson, Notebook 2.pdf/113

 another bench of angular grayish sandstone, 15 ft. or more. Next is another limestone like that at, but no thin nodular one. Above limestone is a thick bed of greenish, very fine grained sandstone, then variegated clays with a medial, light colored 8 foot? Sandstone well exhibited at mouth of tunnell (sic) through “Dakota” ridge on south side of valley. Base of Dakota not conglomeratic but massive, above basal sandstone are alternating thin bedded brown sandstones and black shales for 25 feet or so, then black shale above, the basal shaly and sandstones beds containing numerous plant fragments. Lower half of medial “Dakota” shales are nearly all black, brown sandy seams coming in gradually, the latter in the middle part containing Ostrea and Inoceramus as elsewhere, upper third very sandy, passing