Page:Field Notes of Junius Henderson, Notebook 1.djvu/52

 leaving the others at camp, and went up the creek nearly to the basal Niobrara ((Fort Hayes ls.)). The upper Niobrara is badly folded and probably faulted. Dodds went nearly to the basal limestone and reports narrow, sharp folds, the apex eroded into sharp ravines cutting through the yellow upper shales ((Smoky Hill)) into the darker shales. Further east the shales round into abroad fold, then dip away sharply under the Pierre. At one point is a flat topped hill of Pierre Shale close to the creek, capped by sand and boulders, evidently isolated from the debris sheet of the plains border by erosion. A little W of N from the hill, across a broad valley, upper Niobrara dips SW very slightly, then further E it flattens, then dips to SE, then to east for a long ways thus ((drawing in field book)).