 | Geological Society of London - 1859 - 860 páginas
...the production of the purer compact coals. It is also probable that the comparative impermeability of bark to mineral infiltration is of importance in this...consisting of herbaceous materials and decayed wood, with earthy matter, pyrites. <fec. 6. The microscopic structure of the purer varieties of compact coal accords... | |
 | Sir John William Dawson - 1855 - 498 páginas
...the production of the purer compact coals. It is also probable that the comparative impermeability of bark to mineral infiltration is of importance in this...consisting of herbaceous materials and decayed wood, with earthy matter, pyrites, &c. 6. The microscopic structure of the purer varieties of compact coal accords... | |
 | 1860 - 512 páginas
...the production of the purer compact coals. It is also probable that the comparative impermeability of bark to mineral infiltration is of importance in this...consisting of herbaceous materials and decayed wood, with earthy matter, pyrites, Sec. " 6. The miscroscopic structure of the purer varieties of compact coal... | |
 | sir John William Dawson - 1868 - 870 páginas
...characters, and mode of occurrence of coal. It will also be in accordance with the following statement, from my paper on the Structures in Coal, published...wood, with pyrites and other mineral substances.' " 8. THE DEVONIAN. On the distribution and arrangement of the rocks of this period I have nothing material... | |
 | 1871 - 1024 páginas
...accordance with the chemical composition, microscopical characters and mode of occurrence of coal. It will also be in accordance with the following statement,...wood, with pyrites and other mineral substances." ART. XXXVIII. — On a metiiod of fixing, photographing and exhibiting tfie Magnetic Spectra; by ALFRED... | |
 | 1871 - 504 páginas
...in an erect forest, presents an epitome of a coal-seam. Its roots represent the Stigmaria underday ; its bark the compact coal ; its woody axis, the mineral...wood, with pyrites and other mineral substances." ABT. XXXVllI. — Chi a melfiod of fixing, photographing and exhibiting the Magnetic Spectra; by ALFRED... | |
 | Sir John William Dawson - 1878 - 868 páginas
...characters, and mode of occurrence of coal. It will also be in accordance with the following statement, from my paper on the Structures in Coal, published...material to remain unaffected by causes which have rilled those layers, consisting of herbaceous materials and decayed wood, with pyrites and other mineral... | |
 | 1870 - 488 páginas
...condition of the durable outer bark of erect trees concurs with the chemical theory of coal, in showing the suitableness of this kind of tissue for the production...impermeability of the bark to mineral infiltration, is of no importance in this respect, enabling this material to remain unaffected by causes which have filled... | |
 | Sir John William Dawson - 1888 - 370 páginas
...characters, and mode of occurrence of coal. It will also be in accordance with the following statement, from my paper on the " Structures in Coal," published...wood, with pyrites and other mineral substances." We need not go far in search of the uses of the coal vegetation, when we consider the fact that the... | |
 | Geological Society of London - 1859 - 864 páginas
...the production of the purer compact coals. It is also probable that the comparative impermeability of bark to mineral infiltration is of importance in this...material to remain unaffected by causes which have tilled those layers consisting of herbaceous materials and decayed wood, with earthy matter, pyrites,... | |
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Stigmaria underclay; its bark the compact coal; its woody axis, the mineral charcoal; its fallen leaves (and fruits), with remains of herbaceous plants growing in its shade, mixed with a little earthy matter, the layers of coarse coal. The condition of... 