Geology of the Western Boundary of the Taconic Allochthon Near Troy

32 Figure 4.3 Olive green massive micaceous wacke of the Bomoseen Formation exposed at the Devil's Kitchen in Oakwood Cemetery, Troy. 38 Figure 4.4 Olive green silty shale with thin quartzite beds of the Truthville Formation exposed in a quarry near the type locality of “Diamond Rock”. 42 Figure 4.5 Dark grey to black silty shale of the Browns Pond Formation exposed along Gurley Avenue near the St. Johns Cemetery. 44 Figure 4.6 Browns Pond black silty shale containing sandstone and greywacke lumps. 45 Figure 4.7 Light gray granular quartzite near the base of the Browns Pond Formation exposed at the type locality of the “Diamond Rock Quartzite”. 46 Figure 4.8 Tan to pink, orange or rusty brown-weathering, ferruginous calcareous sandstone beds of the Browns Pond Formation. 48 Figure 4.9 Conglomerates of limestone pebbles in the upper part of the Browns Pond Formation. The matrix is sandy and dolomitic. 50 Figure 4.10 Light gray granular quartzite containing pebbles of dark gray fine-grained sandstone or siltstone near the top of the Browns Pond Formation. 57 Figure 4.11 Indian River green slate underlying the white-weathering black chert beds of the Mount Merino Formation. 58 Figure 4.12 Light gray siliceous argillite with dark gray chert ribbons in the Indian River Formation. 62 Figure 4.13 The Mount Merino Formation: well bedded white-weathering black chert beds interlayered with black shale. 69 Figure 4.14 Sandstone block with primary folds contained in the dark gray to black shale of the Snake Hill formation. 75 Figure 5.1 An anticline with well developed axial plane cleavage seen about 30 meters southwards from the intersection between Route 40 and Northern Drive. 78 Figure 5.3 Chevron folds commonly seen in the dark gray to black shale of the Snake Hill Formation along the Hudson Valley. The outcrop is near the intersection between Northern Drive and the Troy bike trail. 83 Figure 5.5 The foliated zone between the Bomoseen greenish graywacke and the Indian River green slate seen at the Devil's Kitchen in Oakwood Cemetery. The large block at the lower right is dark gray wacke. Most small blocks are light gray siliceous argillite of the Indian River Formation. The matrix is the black shale of the Snake Hill Formation. 85 Figure 5.6 A small reverse fault indicated by a calcareous sandstone interbed in the dark gray to black shale of the Browns Pond Formation. The outcrop is about 25 meters south of the intersection between Route 40 and Northern Drive. 88 Figure 5.7 Bending phenomena of rock chips between small faults associated with the basal thrust of the Taconic Allochthon. 143 Figure 6.11 Strongly curved cleavage surfaces around quartz vein. 149 Figure 6.13 Offsets of marker beds indicating conjugate shears. .

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