. 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. the divide at the head of DeadmanGulch and the northern slopes of the valleys of the two creeks men-tioned, but a definite contact was nowhere found; possibly the finer-grained northeastern portion was more rapidly cooled against the sed-imentary cover, and is a differentiated facies of the larger VANOCKER LACCOLITH. 215 KIKK Kirk Ilill, the western extremity of the Vanocker hiccolith ( section F-G.; PL XLT,
. 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. the divide at the head of DeadmanGulch and the northern slopes of the valleys of the two creeks men-tioned, but a definite contact was nowhere found; possibly the finer-grained northeastern portion was more rapidly cooled against the sed-imentary cover, and is a differentiated facies of the larger VANOCKER LACCOLITH. 215 KIKK Kirk Ilill, the western extremity of the Vanocker hiccolith ( section F-G.; PL XLT, iv), is remarkable chiefly for its com-plete cap of Cambrian limestones and sandstones. The porphyry isseen to plunge under the eastern linil) of the syncline of Paik Creek;and where the small radial streams have breached the Cambrian coverwell-formed columns are shown, normal to the contact. Immediatelyat the contact limestone breccias occur with the usual green shales;and higher, in crescentic scarps that revet the base of the hill, theScolithus quartzite, which is white near Deadwood, is here replacedby massive cross-bedded, rusty sandstones, showing some ScoUthusborings. Above are the upturned edges of Silurian and Carbonif-erous limestone (fig. 83). In places the Cambrian veneer may befollowed from crest to flank continuoush in contact with the surfaceof the poi-jjhyry dome. On the walls of the little canyons the actualdome curvature at the contact
Size: 1270px × 1967px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorunitedst, bookcentury1900, bookdecade1900, bookyear1901
