. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. If (0 » g ^11 Sj 0 ^^ ill HO o o H% o - o o Pi 1^. X o H o So? <; JAGUAR.] STAGES IN EROSION OF LACCOLITHS. 271 Elkhorii was formerly at the Circus Flats stage these streams 1i( wedin an annular valley within the Dakota escarpment. They have shiVt<^4down the monoclinal dip aloii- easilv eroded Red Beds. From the slopes of Elkhorn Mountain small streams radiate r/ithwonderful symmetry, and the dipping strata indicate a quaqi aversa
. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. If (0 » g ^11 Sj 0 ^^ ill HO o o H% o - o o Pi 1^. X o H o So? <; JAGUAR.] STAGES IN EROSION OF LACCOLITHS. 271 Elkhorii was formerly at the Circus Flats stage these streams 1i( wedin an annular valley within the Dakota escarpment. They have shiVt<^4down the monoclinal dip aloii- easilv eroded Red Beds. From the slopes of Elkhorn Mountain small streams radiate r/ithwonderful symmetry, and the dipping strata indicate a quaqi aversalalmost diagrammatic in its regularit}-. The presence of \.^ermianlimestone as the highest flanking stratum lends a special beautj^ to thesymmetry of the liiountain. This limestone, characteristically from30 to 40 feet in thickness and uniform on all sides of the Black Hills,underlain by 90 to 100 feet of soft red sandstone and clay, formshabitually a gentle dip slope ending in an abrupt escarpment, anddrainage radial from the hills cuts V-shaped gateways through it thatare among the most picturesque features of the region. In the samemanner small gate
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Keywords: ., bookauthorunitedst, bookcentury1900, bookdecade1900, bookyear1901
