The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 6
... exist within the Arcti on the other , to drive these plants into t to replace them by Arctic forms . It is evi in those periods when the continental area submerged , there might be an excessive am ure in the atmosphere , greatly ...
... exist within the Arcti on the other , to drive these plants into t to replace them by Arctic forms . It is evi in those periods when the continental area submerged , there might be an excessive am ure in the atmosphere , greatly ...
Pagina 8
... obtain directly from their food , and ind the calcareous matter dissolved in the sea - wat manner great beds of iron - ore exist in the. CHAPTER II VEGETATION OF THE LAURENTIAN AND EARLY PALEOZOIC-QUESTIONS AS TO ALGE.
... obtain directly from their food , and ind the calcareous matter dissolved in the sea - wat manner great beds of iron - ore exist in the. CHAPTER II VEGETATION OF THE LAURENTIAN AND EARLY PALEOZOIC-QUESTIONS AS TO ALGE.
Pagina 9
... exist in the Laurentian . Now , in more recent formations we have deposits of coal and bituminous matter , and we know that these have arisen from the accumulation and slow putrefaction of masses of vegetable matter . Further , in ...
... exist in the Laurentian . Now , in more recent formations we have deposits of coal and bituminous matter , and we know that these have arisen from the accumulation and slow putrefaction of masses of vegetable matter . Further , in ...
Pagina 12
... exist in the continuation tem in the State of New York , while in rock be of this age near St. John , New Brunswick very thick bed of graphitic limestone , and ass it three regular beds of graphite , having a thickness of about five ...
... exist in the continuation tem in the State of New York , while in rock be of this age near St. John , New Brunswick very thick bed of graphitic limestone , and ass it three regular beds of graphite , having a thickness of about five ...
Pagina 26
... exist early in the Erian age , and before the appearance of the ordinary coniferous and lepidodendroid trees . May it not have been a survivor of an old arboreal flora extending back even to the Laurentian itself ? Multitudes of ...
... exist early in the Erian age , and before the appearance of the ordinary coniferous and lepidodendroid trees . May it not have been a survivor of an old arboreal flora extending back even to the Laurentian itself ? Multitudes of ...
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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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