The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 9
... 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 thick beds of graphite and beds ...
... 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 thick beds of graphite and beds ...
Pagina 11
... shales of the Car- boniferous and Silurian rocks . Nor can there be any doubt that the 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 ...
... shales of the Car- boniferous and Silurian rocks . Nor can there be any doubt that the 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 ...
Pagina 12
... shales and and oil - bearing limestones . The beds of gra St. John , some of those in the gneiss at Ticor New York , and at Lochaber and Buckingham where in Canada , are so pure and regular that fairly compare them with the graphitic ...
... shales and and oil - bearing limestones . The beds of gra St. John , some of those in the gneiss at Ticor New York , and at Lochaber and Buckingham where in Canada , are so pure and regular that fairly compare them with the graphitic ...
Pagina 13
... shales . Such bituminous veins occur in the Low Carboniferous limestone and shale of Dorchester a Hillsborough , New Brunswick , with an arrangement ve similar to that of the veins of graphite ; and in the Qu bec rocks of Point Levi ...
... shales . Such bituminous veins occur in the Low Carboniferous limestone and shale of Dorchester a Hillsborough , New Brunswick , with an arrangement ve similar to that of the veins of graphite ; and in the Qu bec rocks of Point Levi ...
Pagina 15
... shales reds of organic some cases , as Cloche Mount- ous shells and by black bitu- ded as natural orrespondence tic rocks , as , arendon , the segregation , en in more e graphitic ch may be vermicular penetrated e state of When ...
... shales reds of organic some cases , as Cloche Mount- ous shells and by black bitu- ded as natural orrespondence tic rocks , as , arendon , the segregation , en in more e graphitic ch may be vermicular penetrated e state of When ...
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Termeni și expresii frecvente
acrogens aërial roots Algæ allied America appear arctic areoles bark beds belong bituminous branches Brongniart bundles Calamites Canada Carboniferous Caulopteris cells cellular character climate coal coal-formation conifers Cordaites cycads cylinder Dadoxylon Dawson Demy 8vo described Devonian diameter Eocene Erian Europe exogenous Fcap ferns flora formation forms fossil plants fronds fructification fruit Gaspé genera genus Geological Society graphite Greenland hemisphere Illustrations Journal Laramie Laurentian leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores medullary rays Mesozoic Middle modern Nova Scotia occur outer Paleozoic period Permian petioles pines pinnate pinnules pith present probably Prof Psilophyton referred resemble Rhizocarps ribbed rocks sandstones scalariform scars Second Edition Sequoia shales Sigillaria Silurian similar Small crown 8vo species specimens Sphenophyllum Sporangites spore-cases spores sporocarps stems Sternbergia structure Tertiary thick Third Edition tion tissue tree-ferns trees trunks Upper Cretaceous vascular vegetable vols Williamson wood woody
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