. Annual report. New York State Museum; Science; Science. 122 NEW YORK STATE MUSEUM consisting of a dozen such grains. It is possible that these came from the grits. But if so, it is surprising that there are not larger fragments from the same source, since these grits are exceedingly tough and well-cemented rocks. Structural features. The dissection of the knob by quarrying operations has brought to light some new structural features. Woodworth described two faults along the margin of the knob, and his section (figure 9) shows his conception of the rela- tions of lava and shale. But quarrying
. Annual report. New York State Museum; Science; Science. 122 NEW YORK STATE MUSEUM consisting of a dozen such grains. It is possible that these came from the grits. But if so, it is surprising that there are not larger fragments from the same source, since these grits are exceedingly tough and well-cemented rocks. Structural features. The dissection of the knob by quarrying operations has brought to light some new structural features. Woodworth described two faults along the margin of the knob, and his section (figure 9) shows his conception of the rela- tions of lava and shale. But quarrying brought to light other masses of shale, involved with lava, within the knob. We found evidence of severe compressive disturbance and dislocation all through the lava mass of the knob, suggesting a number of minor dislocations throughout the mass, instead of merely the two which Slates. Fig. 12 Sketch of relations of shale and lava near the south end of the knob; shale overlying lava on the projecting point at the left, and a steep shale wedge in the lava midway he saw, which were all that could have originally been recognized. A few sketches, and a comparison of them with our photograph of the knob (plate 18), will aid in the presentation of the details. Figure 12 is a diagram of the south end of the quarried face of the knob, with a projecting point on the left which remains unquarried. On that point, slate overlies trap. Woodworth's sec- tion, in which trap overlays shale, was made a little farther south, and the remnants may be seen just over the roof of the engine house in plate 18. To the north of the point, shown in the sketch, trap makes the full height of the face and the shale has pinched out, but up this face runs another very steeply inclined, shale wedge, which runs nearly to the top before pinching out. Because of the section which Woodworth saw and figured, he judged a. Please note that these images are extracted from scanned page images that may have been digita
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