Report of the State Geologist on the Mineral Industries and Geology of Vermont, Volume 8 |
Contents
| 172 | |
| 184 | |
| 184 | |
| 184 | |
| 190 | |
| 191 | |
| 195 | |
| 196 | |
| 50 | |
| 100 | |
| 105 | |
| 107 | |
| 112 | |
| 118 | |
| 128 | |
| 130 | |
| 146 | |
| 146 | |
| 147 | |
| 152 | |
| 152 | |
| 158 | |
| 159 | |
| 162 | |
| 198 | |
| 209 | |
| 220 | |
| 224 | |
| 226 | |
| 228 | |
| 232 | |
| 234 | |
| 236 | |
| 238 | |
| 240 | |
| 242 | |
| 244 | |
| 246 | |
| 247 | |
| 250 | |
Other editions - View all
Common terms and phrases
amphibolite anticlinal basin beds belt of slate Black River Brook C. H. Hitchcock C. H. Richardson Cambrian Champlain Valley Charlestown Chazy chloritic clays cleavage conglomerate Connecticut Conway group Conway schists County Craftsbury deposits Devonian diabase dikes east eastern extends fault formation fossils G. H. Perkins Geologist Geology of Vermont gneiss Goshen Grand Isle granite Green Mountains green schists Hanover Hill Hudson igneous inches intrusives Irasburg Isle La Motte Lake Champlain Lake Memphremagog ledges limestone locality Lower Cambrian marble mass Memphremagog metamorphic mica schist miles northern Norwich Ordovician outcrops pebbles phyllite Plate Pleistocene present Professor Quadrangle quarries quartz quartzite region ridge rocks schists sericite sericite schist shale shows side Sixth Report staurolite strata structure surface synclinal T. N. Dale terranes tests Thetford thickness thru town township Trenton village voltage Waits River Waits River limestone western
Popular passages
Page 226 - The pieces were supported in a horizontal position, upon wooden knife edges 22 inches apart and the loads were applied upon another knife edge placed half way between the supports. This load being applied by means of sand running out of an orifice in a box, at the rate of 70 pounds per minute, the flow being checked by means of an electric attachment the moment rupture took place.
Page 41 - ... about 50 feet, joined the broad expanse of water in the Ontario basin with the larger expanse in the St. Lawrence and Ottawa valleys and the basin of Lake Champlain. At the subsequent time of ingress of the sea past Quebec the level of Lake...
Page 218 - One of the most remarkable slate belts of this country lies in eastern New York and western Vermont, between the Taconic range on the east and Lake Champlain and the Hudson on the west, and chiefly between the Hoosic River on the south and the towns of Benson and Hubbardton, in Vermont, on the north. It attains a maximum length of 68 miles and an average width of about seven miles. The great producing centres lie in Washington County, NY, and Rutland, Vt. The slates in this field are green of various...
Page 219 - ... square being a sufficient number of pieces of slate of any size to cover 100 square feet of roof, with allowance generally for a 3-inch lap. The size of the pieces of slate making up a square ranges from 7 by 9 inches to 16 by 24 inches, and the number of pieces in a square ranges from 85 to 686, according to the size of the pieces. The ordinary thickness of a piece is from one-eighth to three-sixteenths of an inch, and the approximate weight per square is about 650 pounds. The slate is generally...
Page 226 - ... amount of disintegration through freezing. Density tests are of value, since the greater the specific gravity of one of several similar substances, the greater is its strength. Hardness may or may not be a desirable quality, accordingly as it is related to density or to brittleness. Lastly a test for corrodibility, or the capacity of being disintegrated by the chemical action of smoke and of fumes from manufactories, is desirable. (1) STRENGTH AND TOUGHNESS.
Page 226 - S=2^, in which w is the load in pounds which causes the rupture, 1 the distance between the supports in inches, b the breadth and d the thickness of the plate in inches. S is the number of pounds per square inch. According to these tests the modulus of rupture in the best states should range from 7,000 to 10,000 pounds.
Page 41 - ... now, and the lower part of its extent has become covered by the present lake. From the time of the union of Lakes Iroquois and Hudson-Champlain...
Page 219 - squares," a square being a sufficient number of pieces of slate of any size to cover 100 square feet of roof, with allowance generally for a 3-inch lap. The size of the pieces of slate making up a square ranges from 7 by 9 inches to 16 by 24 inches...
Page 89 - We have found striking examples where the pebbles of conglomerates have been elongated and flattened so as at length to be converted into the silicious lamince of the schists and gneiss and the cement into mica, tak, and feldspar.
Page 50 - ... this report is correct, the lake was at this time about 200 feet above the then sea level. The floor of the Hudson gorge at Coveville was about 100 feet above sea level as it is today. The Hudson gorge from Coveville southward must have been largely cleared of the clays and other glacial deposits. Gradually the filling of clays in the old gorge through which the Hudson now passes Schuylerville was removed and the discharge from Lake Vermont fell into this lower channel reducing the level of the...