The American Journal of Science, Volumes 185-186J.D. & E.S. Dana, 1913 - Science |
Contents
| 1 | |
| 91 | |
| 109 | |
| 120 | |
| 121 | |
| 123 | |
| 131 | |
| 133 | |
| 561 | |
| 577 | |
| 591 | |
| 598 | |
| 600 | |
| 605 | |
| 611 | |
| 619 | |
| 139 | |
| 149 | |
| 171 | |
| 187 | |
| 189 | |
| 204 | |
| 205 | |
| 214 | |
| 231 | |
| 251 | |
| 254 | |
| 267 | |
| 273 | |
| 282 | |
| 283 | |
| 289 | |
| 290 | |
| 297 | |
| 305 | |
| 308 | |
| 315 | |
| 328 | |
| 336 | |
| 337 | |
| 350 | |
| 369 | |
| 385 | |
| 389 | |
| 395 | |
| 401 | |
| 424 | |
| 427 | |
| 439 | |
| 446 | |
| 469 | |
| 486 | |
| 517 | |
| 526 | |
| 560 | |
| 633 | |
| 636 | |
| 639 | |
| 644 | |
| 650 | |
| 109 | |
| 123 | |
| 131 | |
| 141 | |
| 151 | |
| 160 | |
| 169 | |
| 180 | |
| 186 | |
| 187 | |
| 214 | |
| 231 | |
| 251 | |
| 282 | |
| 289 | |
| 297 | |
| 305 | |
| 313 | |
| 315 | |
| 328 | |
| 385 | |
| 395 | |
| 401 | |
| 416 | |
| 427 | |
| 576 | |
| 577 | |
| 591 | |
| 598 | |
| 605 | |
| 636 | |
| 644 | |
| 654 | |
| 664 | |
Other editions - View all
Common terms and phrases
a-rays acid albite alkaline angle appear bands barium beds benzene bromine carbon cent chemical chlorine color composition compression conglomerate copper crystals curve Cuzco cycads delafossite deposits described determined Devonian effect electrons equation Estancia Ethyl eurypterids evidence experiments fauna feet field formation fossils Geol Geological given glass gneiss gram granite gravel heat hydrochloric acid index ellipsoid ionization ions iron island JOUR Journal lake lava layer limestone liquid lower magma magnetic mass material measured metal meters method mineral observed obtained occur optical oxide Permian plane plates portion present pressure Pterophyllum quartz radiation rays reaction reefs refractive index region rocks sandstone SCI.-FOURTH SERIES selenic selenic acid shales Shinarump shown sodium solid solution species specimens strata substances sulphate sulphur surface Table temperature theory thickness tion tube unconformity upper valley vapor velocity volume Williamsonia
Popular passages
Page 428 - Amphigenia found in the Oneonta sandstone of New York may be a fresh-water form, but it occurs in the Montrose sandstone in southern Pennsylvania so far away from the old shore line that fresh-water conditions seem, certainly, improbable. The stratigraphical relations of the fishes have been generally misunderstood. The fishes exist, for the most part, not in the Catskill but midway in the Chemung ; the celebrated Holoptychius bed is the second of the ore beds of the "Mansfield Red...
Page 191 - It tends to support the theory that Mousterian man was a degenerate offshoot of early man, and probably became extinct ; while surviving man may have arisen directly from the primitive source of which the Piltdown skull provides the first discovered evidence.
Page 246 - ... as compared with the influence of temperature upon solubility. Uniform pressure tends to further those reactions which are accompanied by a decrease of volume; but it by no means follows that it will cause these (or other) reactions to occur; for whether a reaction takes place or not is determined by its velocity under the particular conditions, and such evidence as there is tends to show that reaction velocity is not much affected by uniform pressure. The effects of non-uniform pressure greatly...
Page 419 - Button thus introduces the discussion of the Shinarump: Resting everywhere upon the Carboniferous of the Plateau country is a series of sandy shales, which in some respects are the most extraordinary group of strata in the West, and perhaps the most extraordinary in the world There are especially three characteristics, either one of which would render them in the highest degree conspicuous, curious, and entertaining. First may be mentioned the constancy with which the component members of the series...
Page 637 - An index to the scientific contents of the Journal and proceedings of The Academy of Natural Sciences of Philadelphia. Published in commemoration of the centenary of the Academy, March 21, 1912. Academy of Natural Sciences, Philadelphia, xiv + 1419 p. [Preface dated 27 March 1913.] Norman, JR 1938. Notes on the dates etc. of the "Memorias," "Repertorio," "Synopsis" and "Enumeratorio
Page 434 - Kunn of Cutch, an area of 10,000 square miles flooded by the sea for a part of the year, during the period of onshore monsoon winds. In the detection of mud-cracks in ancient formations, reasonable care must be used to avoid mistaking for them a polygonal cracking of the rock arising after its solidification. The two, however, are readily distinguished. True mud-cracks always have a filling, the polygons are irregular but do not show an irregularity constant in one direction.
Page 459 - Subiithii group ; so it seems probable that from early Tertiary times the sea has been excluded from the Sub-Himalayan region, and that the whole of the Sub-Himalayan deposits, above the Subathu group, are fresh-water and fluviatile, and formed on the surface of the land. They are in fact, subaerial formations, like the river alluvium and bhabar deposits of the present day...
Page 180 - ... corals were to grow up from a bank, with a level surface some fathoms submerged, having steep sides and being situated in a deep sea, a reef not to be distinguished from an atoll, might be formed : I believe some such exist in the West Indies. But a difficulty of the same kind with that affecting the crater theory, renders, as we shall presently see, this view inapplicable to the greater number of atolls.
Page 613 - ... reigns past, it had kept below the level of the surrounding plain, continually extending its surface and increasing its depth, and occasionally throwing up, with violent explosion, huge rocks or red-hot stones. These eruptions, they said, were always accompanied by dreadful earthquakes, loud claps of thunder, with vivid and quick-succeeding lightning.
Page 433 - Limestones are carried in solution and their development requires a comparative absence of sand and clay, the mechanical deposits carried by rivers and by waves. The solutions to have sufficient concentration may come from permanent water bodies, either lakes or seas. The deposit therefore comes not from the direction of the land, but from the direction of the sea. The cracking goes on between the extreme levels of...