 | Joseph Silas Diller - 1898 - 508 σελίδες
...near the surface by volcanic action and spread out in streams or layers, either as continuous flows or as accumulated fragments of lava. On account of...surface, solidify more slowly than volcanic rocks and attain a rather coarsely crystalline granular structure, excepting along their borders, where they... | |
 | Joseph Silas Diller - 1898 - 508 σελίδες
...spread out in streams or layers, either as continuous Hows or as accumulated fragments of lava. Un account of their sudden cooling many volcanic rocks...wholly glassy or only partially crystalline. Others are holoerystalline, but the mineral par tides forming the principal mass in such cases are usually, but... | |
 | Washington Geological Survey (1911-1921) - 1902 - 472 σελίδες
...volcanic action and are either spread out in layers, intruded into fissures as dikes, or accumulated as fragments of lava. On account of their sudden cooling, many volcanic rocks are glassy or only partly crystalline. Others are wholly crystalline, the crystals generally, but not always,... | |
 | William Farrand Prosser - 1903 - 754 σελίδες
...volcanic action and are either spread out in layers intruded into fissures as dikes, or accumulated as fragments of lava. On account of their sudden cooling many volcanic rocks are glassy or only partly crystalline, others are wholly crystalline, the crystals generally but not always... | |
 | Wisconsin Geological and Natural History Survey - 1904 - 296 σελίδες
...surface by volcanic action, while yet in a molten condition, and spread out in streamfe or layers. On account of their sudden cooling, many volcanic rocks are either wholly glassy or only partially crystallized. Undoubtedly the rhyolite in this vicinity was originally only a partially crystallized... | |
 | Wisconsin Geological and Natural History Survey - 1904 - 264 σελίδες
...the surface by volcanic action, while yet in a molten condition, and spread out in streams or layers. On account of their sudden cooling, many volcanic rocks are either wholly glassy or only partially crystallized. Undoubtedly the rhyolite in this vicinity was originally only a partially crystallized... | |
 | Wisconsin Geological and Natural History Survey - 1904 - 258 σελίδες
...surface by volcanic action, while yet in a molten condition, and spread out in streamls or layers. On account of their sudden cooling, many volcanic rocks are either wholly glassy or only partially crystallized. Undoubtedly the rhyolite in this vicinity was originally only a partially crystallized... | |
 | Wisconsin Geological and Natural History Survey - 1904 - 260 σελίδες
...the surface by volcanic action, while yet in a molten condition, and spread out in streams or layers. On account of their sudden cooling, many volcanic rocks are either wholly glassy or only partially crystallized. Undoubtedly the rhyolite in this vicinity was originally only a partially crystallized... | |
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... or layers. On account of their sudden cooling, many volcanic rocks are either wholly glassy or only partially crystallized. Undoubtedly the rhyolite in this vicinity was originally only a partially crystallized rock when brought to the surface. A... 