Eleventh annual report of the United States Geological and Geographical Survey of the Territories : embracing Idaho and Wyoming : being a report of progress of the exploration for the year 1877 . ionXXXVII, a mile to the east, is paved with the limestones, of whichabout 500 feet are exposed in the abrupt declivity in which the easternface of this ridge breaks down. In the summit at Station XXXVII theupper layers of dark-drab limestone dip at angles of 15° to 20° westward,and is underlaid by gray and buff cherty limestone with calcite, andcontaining a Litfiostroiion (L. Whitney i f) and a form
Eleventh annual report of the United States Geological and Geographical Survey of the Territories : embracing Idaho and Wyoming : being a report of progress of the exploration for the year 1877 . ionXXXVII, a mile to the east, is paved with the limestones, of whichabout 500 feet are exposed in the abrupt declivity in which the easternface of this ridge breaks down. In the summit at Station XXXVII theupper layers of dark-drab limestone dip at angles of 15° to 20° westward,and is underlaid by gray and buff cherty limestone with calcite, andcontaining a Litfiostroiion (L. Whitney i f) and a form of Syringopora. Thisridge is blocked out of the Carboniferous limestones, and the narrowgulch which separates it from the next west-lying sandstone ridge isfloored with large exposed surfaces of the rock, which are here and thereobstructed with sink-holes, and on the lower side pretty little lakeletsare hollowed out of the soft red deposit at the foot of the bluff. Whenthe rapidly-descending gulches reach the horizon of the heavy-beddedNiagara, their beds are precipitated several hundred feet down steepslopes, which, earlier in the season, when the streams are full from the
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