. Bulletin - New York State Museum. Science. 24 NEW YORK STATE MUSEUM part of the slope of the mountain was wave washed during the late marine invasion of the Champlain valley. I could not determine that the delta surface immediately north of this locality exhibited a trace of dislocation attributable to the post- glacial origin and continuation of this supposed fault into the rocks underlying the delta. Probable fault on Mt St John, Quebec. Mt St John is the small conical elevation of basic igneous rock seen standing up on the plains between northern Vermont and the St Lawrence river. Viewed
. Bulletin - New York State Museum. Science. 24 NEW YORK STATE MUSEUM part of the slope of the mountain was wave washed during the late marine invasion of the Champlain valley. I could not determine that the delta surface immediately north of this locality exhibited a trace of dislocation attributable to the post- glacial origin and continuation of this supposed fault into the rocks underlying the delta. Probable fault on Mt St John, Quebec. Mt St John is the small conical elevation of basic igneous rock seen standing up on the plains between northern Vermont and the St Lawrence river. Viewed from the train on the Intercolonial Railway between Chamblj' and Beloeil, St John presents an outline on its northern aspect like that shown in the appended sketch, figure 6. On ascending the mountain as high as the quarries. Fig. 6 Outline of Mt St John (Monnoir) viewed from the north. The lower part of the iketch is meant to show the tc?p of the forest. worked on its eastern face near the summit, it is found that the steps shown in the above view are separated from the slope back of them by evidences of fracture, and in one case, I believe, also of dislocation. The most pronounced fissure which I exam- ined at the level of the highest quarry showed a gap partly filled with large blocks which had tumbled in from the sides and the slope of the mountain above the bench. The fissure opens at the surface much above the level to which, according to my determinations, the sea extended in the postglacial marine inva- sion ; moreover, the chasm is not of the wave-made type. When the sea makes a chasm it removes in so doing the blocks of rock in and about it or above the level of the chasm floor. The annexed sketch, which below the surface line is partly conjec- tural, gives at least the superficial aspects of the locality as I saw Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
Size: 2494px × 1002px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
