The American Journal of Science, Volumes 183-184J.D. & E.S. Dana, 1912 - Science |
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Common terms and phrases
acetic acid albite amount analysis angle anorthite appears Basin beds black shale bones Carboniferous carnegieite cathode cent Chagrin Chattanooga shale chemical Cleveland shale coast color column composition containing copper crystals curve Cuzco deposits described determined Devonian Diadectes dikes esters ethyl evidence fauna feet feldspar ferrous formation fossils Geological glass grams granite heat Huron hydrochloric acid hydrogen sulphide ilmenite indicate intrusion ionization iron Island JOUR layers limestone lower marcasite material measured metal metamorphism method miles mineral mixture nephelite nitric acid observed obtained occur Ohio shale oölite Ordovician oxalate oxide Paleozoic paper pegmatite plates platinum portion precipitation present pressure probably Professor pyrite pyrrhotite quartz quartzite ratio region River rocks sandstone schist SCI.-FOURTH SERIES sediments shown silica sodium solution species specimens sulphate sulphur surface Survey Table temperature thickness tion tube unconformity upper valley vanadium
Popular passages
Page 515 - Tests of the absorptive and permeable properties of Portland cement mortars and concretes, together with tests of damp-proofing and water-proofing compounds and materials...
Page 405 - Chlamydosaurus, of Australia, and several lacertilian species of our own Southwest. That water was rare and at a premium when the rains did come is evidenced by the frequency of the association of rainprints with the dinosaurian tracks and the above mentioned mudcracks which followed the passage of the animal.
Page 403 - Silt and sand will be blown over and fill up the cracks developed by the drying of argillaceous water-laid deposits. Consequently, the sand is filled in under the raised rims of the polygonal discs and becomes continuous with the mantle of sand above. In this way, the concavity upward of the individual plates is preserved, and the mud-cracks are not obliterated, even in a silty clay which would slack and crumble immediately upon being re-wet by the advancing waters of the following inundation. Experiments...
Page 403 - ... water-laid deposits. Consequently, the sand is filled in under the raised rims of the polygonal discs and becomes continuous with the mantle of sand above. In this way, the concavity upward of the individual plates is preserved, and the mud-cracks are not obliterated, even in a silty clay which would slack and crumble immediately upon being re-wet by the advancing waters of the following inundation. Experiments by the writer [Barrell] go to show that the upturned edges of the clay plates would...
Page 98 - Report on the Progress and Condition of the US National Museum for the year ending June 30, 1908.
Page 380 - A Laboratory Manual OF Physics and Applied Electricity ARRANGED AND EDITED BY EDWARD L. NICHOLS Professor of Physics in Cornell University IN TWO VOLUMES Vol. I. JUNIOR COURSE IN GENERAL PHYSICS BY ERNEST MERRITT and FREDERICK J. ROGERS Cloth.
Page 59 - This is true in general for day transmission. The absorption at night was found to be entirely irregular, varying from zero to the day value, but is less during the winter than in summer. The great variations in night absorption make useless all attempts to judge the quality...
Page 399 - ... higher than the Rhaetic beds of Bavaria." After a very careful comparison of the Newark fishes with those of several European faunas, Eastman holds that the fishes seem to indicate a somewhat earlier date. He says (p. -32): " This tends, therefore, to confirm the conclusion already put forward that the Triassic fish fauna of eastern North America is of a more or less manifold nature, and corresponds in a general way to the interval between the Upper Muschelkalk and the basal division of the Keuper...
Page 400 - ... deposit of the next flood tide, constitute the so-called ' birdtracks ' which have been found in such great numbers and perfection. " The sands( had reached a considerable thickness over the first trap bed when a second outflow of the trap followed, represented by the posterior bed, or Hampden diabase. Immediately after the outflow of this sheet an explosive eruption took place, and blocks of diabase and pulverized lava were spread by the waters over a broad area, forming the Granby tuff bed....
Page 126 - ... fourteen to fifteen and a half feet. But farther east, if the Devonian limestone were exposed, it might be found that thicker sections occurred again. The well record near Mullins Station, in Rockcastle county, suggests a thickness of twenty feet. Another thick section of Devonian limestone occurs three miles southwest of Cartersville, where the road to Crab Orchard crosses the headwaters of Harmon creek. Here the Devonian limestone is seventeen feet thick. Half way between this locality and...