Page:Field Notes of Junius Henderson, Notebook 2.pdf/64

The two schist mountains shown on the map tower far above the sedimentaries flanking them. The dip of cleavage planes is very steep, dipping west, with a strike a little W of N, approximately the same as the sedimentaries to the west, and so pronounced as to make the mountain in places look as if composed of stratified rocks. The western formations are a normal monocline. The anticline east of Masonville Masonville, Colorado seems to have overturned and developed into a thrust fault which has carried it up over the Dakota, and all the formations above the Lyons have been planed off. It seems likely that these formations formerly extended over the high mountain and joined the corresponding strata to the east in the present monocline, or rather that the strata were continuous in a more nearly level position before the development of the fold. Reached hotel at 6:15 very tired, having done a large amount of rapid climbing on foot and driven over 32 miles. Had a fine team, though skittish and headstrong.