Bulletin of the United States Geological SurveyThe Survey., 1910 - Geology |
Contents
| 9 | |
| 30 | |
| 60 | |
| 71 | |
| 77 | |
| 87 | |
| 109 | |
| 130 | |
| 282 | |
| 286 | |
| 300 | |
| 307 | |
| 333 | |
| 379 | |
| 380 | |
| 388 | |
| 168 | |
| 168 | |
| 186 | |
| 214 | |
| 243 | |
| 250 | |
| 410 | |
| 418 | |
| 490 | |
| 512 | |
| 518 | |
| 534 | |
Other editions - View all
Common terms and phrases
Air dried analyses Basin beds of coal bench Black Buttes Bone British thermal units brown burned Canon City carbon carbonaceous Clay coal bed Coal Company coal field Colorado conglomerate Crazy Woman Creek Creek district Divide Basin dome drab Dry coal east entry exposed exposure fault feet thick following section formation fossils geologic gray horizon igneous rock inches thick Laramie Laramie formation lignite Little Snake River locality located lower massive Mesa Mesaverde miles mines moisture Montana Mountain occur opened Pierre shale places probably prospect Pure coal Railroad ranch Raton Mesa region Rock Springs coal Rock Springs field Rockvale samples sand sandy Section of coal shaft slope southeast Springs coal group strata surface Survey syncline thin beds Total coal township Trinidad field Trinidad sandstone U. S. Geol unconformity Union Pacific Railroad valley Walsenburg Wasatch formation weathering workable Wyoming zone
Popular passages
Page 392 - Creek and 2 miles southeast of Trinidad, on the northern slopes of Raton Mesa, below Fishers Peak, and is reached by a branch line of the Denver and Rio Grande Railroad. For a number of years coal from the Engle mine was coked in the ovens at Elmoro, 4 miles northeast of Trinidad. The mouth of the Starkville mine is situated on the main line of the Atchison, Topeka and Santa Fe Railway on the east side of North Raton Creek, 3 miles south of Trinidad. The coal bed worked in the Engle and Starkville...
Page 29 - The table on page 1199 shows that to produce one electrical horsepower hour in the producer-ga,s plant required 2.29 pounds of dry North Dakota lignite, whereas to produce the same result in the steam plant required 3.39 pounds of the best West Virginia coal. This means that North Dakota lignite, with the moisture eliminated, will do more work when used in a producergas plant than the best coal of the country will do in a steam plant.
Page 381 - Halymenites major Lesquereux, is pitted and cylindrical in cross section and is easily recognized. "LARAMIE" FORMATION. The Trinidad sandstone is conformably overlain by a mass of coalbearing sandstone and shale which ranges in thickness from 3,000 feet at the west end of the field to 1,500 feet at the east end. The greater part of the surface of the coal field is occupied by these rocks, which outcrop in the area between the Trinidad sandstone escarpment and the highland surrounding the Spanish...
Page 213 - The three largest tributaries of Bitter Creek — Killpecker, Little Bitter, and Salt Wells creeks — have been shaped indirectly by the fold. On account of the difference in the hardness of the beds these valleys extend in the main along the strike of the beds and are approximately at right angles to Bitter Creek.
Page 308 - But the intrusion, both above and below the coal, of sheets of eruptive conglomerate which, a short distance south of No. 6, consolidate into one large body and thus determine the southern limit of the productive outcrop, throws some doubt on the identity of these seams until further extension of the respective workings shall have settled the question. Workable coal has been opened up some distance north of No. 5, but the locality is badly faulted. There is also another opening near the railway track...
Page 214 - River basin and partly divide the southern portion into two smaller basins, the Bridger Basin on the west and the Red Desert or Washakie Basin on the east. The major north-south axis of the dome is approximately 90 miles long and is located close to the west limb of the anticline. The beds along this limb dip from 5° to 30° W.; those along the east limb dip from 5° to 10° E. The minor...
Page 246 - Commercially available 1.46 1.29 1.24 1 36 1 "1 1 16 The Rock Springs coal as a locomotive fuel or steam coal has few superiors in the West. It burns under a forced draft without heavy sparking and is a quick steamer, leaving only a small quantity of ash. Although the coals of the Almond, Black Buttes, and Black Rocks coal groups have been mined and prospected very little in the past, the future no doubt will see extensive mining on all these coal beds. During the summers of 1 907 and 1 908 two mines...
Page 284 - ... or on the grate — may be very serious. It may not be extreme to suggest that this loss possibly amounts in certain cases to as much as that incurred through weathering in some of the subbituminous coals. UNDERGROUND WEATHERING. The analyses bear evidence, according to my tentative interpretation, that the phenomena of weathering are not confined to outcrops or shallow prospects. There are a number of coals in which I suspect oxygenation to have taken place to some extent in shallow mines or...
Page 216 - ... out. Some of the larger faults have been traced for a distance of more than 20 miles. The general trend of the faults is nearly at right angles to the strike of the rocks or across the axis of the major anticline. In some places, however, the angle of departure is large and the fault parallels the strike more nearly than the dip of the beds.
Page 491 - The amount of gasoline was in many samples too small for systematic determination of the percentage of unsaturated hydrocarbons in it. The method consists in shaking 25 cubic centimeters of the crude petroleum with 25 cubic centimeters of sulphuric acid of specific gravity 1.83, corresponding to ordinary pure sulphuric acid, about the equivalent of that used in petroleum refining. The acid and oil are shaken in a small flask with a long neck, the neck holding 25 cubic centimeters. The flask is then...