. Bulletin - New York State Museum. Science. GEOLOGY OF THE VICINITY OP LITTLE FALLS 45 drag, it also throws to the west, as does the main fault, and it is likely a small branch of the latter. It would indicate that the dying out of the fault is probably produced in part by branching. Between these two points a bend in the creek carries its east bank back against the fault plane, which here forms a nearly per- pendicular cliff some 80 feet in hight, rising directly from the creek margin. The topographic map is not quite accurate here, so that it is impossible to properly show this feature upon
. Bulletin - New York State Museum. Science. GEOLOGY OF THE VICINITY OP LITTLE FALLS 45 drag, it also throws to the west, as does the main fault, and it is likely a small branch of the latter. It would indicate that the dying out of the fault is probably produced in part by branching. Between these two points a bend in the creek carries its east bank back against the fault plane, which here forms a nearly per- pendicular cliff some 80 feet in hight, rising directly from the creek margin. The topographic map is not quite accurate here, so that it is impossible to properly show this feature upon it, an excessive bend and an incorrect course being required to bring the fault to the creek on the map as it stands. The fault plane con- tinues at the margin for only a few yards, then runs diagonally up the cliff face, updragged Utica shale appearing at the base,. Scale lin = 2;5^oft Fig. 8 Section across East Canada creek at tlie point wliere the Dolgeville fault forms the east banli. U=Utica shale, T=Trenton limestone, L=Lowville limestone and B=the Beekmantown beds. The fault breccia is also shown. The section crosses the east wall at the right in plate 6. and running constantly higher, till it forms the entire hight of the clifif. The features are magnificently shown, but are unfortunately difficult to photograph satisfactorily, plate 7 showing them as well as it is possible to bring them out. Figure 8 gives a scale drawing of the section here. A fault breccia from 2 to 5 feet wide, consisting of a multitude of angular fragments of all sizes, in Avhich Beekmantown material largely predominates, but with a considerable contribution from the Lowville and Trenton als'o, embedded in a black, fine grained matrix, which seems largely of I'tica origin, occurs here. There is a layer of chert near the sum- mit of the Beekmantown here, as elsewhere, and this has naturally been a large contributor to the breccia. It has been also largely impregnated with pyrite or marcasite, which
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
