The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 9
... graphite , that bituminous shales have been converted into graphitic shales , and that cracks filled with soft bituminous matter have ultimately become changed into veins of graphite . When , therefore , we find in the Lau- rentian ...
... graphite , that bituminous shales have been converted into graphitic shales , and that cracks filled with soft bituminous matter have ultimately become changed into veins of graphite . When , therefore , we find in the Lau- rentian ...
Pagina 10
... graphite occurs associate cite , quartz , orthoclase , or pyroxene , and eit seminated scales , in detached masses , or in ban " separated from each other and from the w feldspar , pyroxene , and quartz . " Dr. Hunt tions the occurrence ...
... graphite occurs associate cite , quartz , orthoclase , or pyroxene , and eit seminated scales , in detached masses , or in ban " separated from each other and from the w feldspar , pyroxene , and quartz . " Dr. Hunt tions the occurrence ...
Pagina 11
... graphite found in the beds has been de- posited along with the calcareous matter or muddy and sandy sediment of which these beds were originally com- posed . * The quantity of graphite in the Lower Laurentian series is enormous . Some ...
... graphite found in the beds has been de- posited along with the calcareous matter or muddy and sandy sediment of which these beds were originally com- posed . * The quantity of graphite in the Lower Laurentian series is enormous . Some ...
Pagina 12
... graphite , having a thickness of about five feet . * It may fairly be assumed that in the pre and in those geological periods with whose mains we are more familiar than with those rentian , there is no other source of unoxidize rocks ...
... graphite , having a thickness of about five feet . * It may fairly be assumed that in the pre and in those geological periods with whose mains we are more familiar than with those rentian , there is no other source of unoxidize rocks ...
Pagina 13
... graphite nce to the mestones . Society , " vol . We may compare the disseminated graphite to th which we find in those districts of Canada in which Sil rian and Devonian bituminous shales and limestones ha been metamorphosed and ...
... graphite nce to the mestones . Society , " vol . We may compare the disseminated graphite to th which we find in those districts of Canada in which Sil rian and Devonian bituminous shales and limestones ha been metamorphosed and ...
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Termeni și expresii frecvente
Acrogens aërial roots Algæ allied America appear Archæopteris arctic areoles bark beds belong bituminous branches Brongniart bundles Calamites Canada Carboniferous Caulopteris cellular character clay climate coal coal-formation cones conifers Cordaites cycads cylinder Dadoxylon Dawson Demy 8vo deposits described Devonian dicotyledonous Eocene Erian Europe exogenous Fcap ferns flora formation forms fossil plants fronds fructification fruit Gaspé genera genus Geological Society Greenland Heer hemisphere Illustrations land Laramie leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores medullary rays Mesozoic Middle Miocene modern northern Nova Scotia occur outer Palæozoic period Permian pines pinnules pith present probably Prof Psilophyton referred resemble Rhizocarps ribbed rocks sandstones scalariform Sequoia shales Sigillaria Silurian similar Small crown 8vo species specimens Sphenophyllum Sphenopteris Sporangites spore-cases spores sporocarps stems Sternbergia structure Tertiary thick tion tissue transverse tree-ferns trees trunks types Upper Cretaceous vascular scar vegetable wood woody
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