The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 6
... regions to exist within the Arctic Circle ; and , on the other , to drive these plants into the tropics and to replace them by Arctic forms . It is evident also that in those periods when the continental areas were largely submerged ...
... regions to exist within the Arctic Circle ; and , on the other , to drive these plants into the tropics and to replace them by Arctic forms . It is evident also that in those periods when the continental areas were largely submerged ...
Pagina 8
... regions . So numerous and extensive , in- deed , are the exposures of these rocks , that we have good reason to believe that they underlie all the other forma- tions of our continents , and are even world - wide in their distribution ...
... regions . So numerous and extensive , in- deed , are the exposures of these rocks , that we have good reason to believe that they underlie all the other forma- tions of our continents , and are even world - wide in their distribution ...
Pagina 47
... region west of the Rocky Mountains . On the seaward sides of these there were low lands covered with vegetation , while on the inland side the great in- terior sea , with its verdant and wooded islands , realised , though probably with ...
... region west of the Rocky Mountains . On the seaward sides of these there were low lands covered with vegetation , while on the inland side the great in- terior sea , with its verdant and wooded islands , realised , though probably with ...
Pagina 103
... regions than farther to the northeast ; † and it would not be surprising if similar plants occurred in later beds in Devonshire or in the south of Europe than in Scotland . Still , these facts , properly understood , do not invalidate ...
... regions than farther to the northeast ; † and it would not be surprising if similar plants occurred in later beds in Devonshire or in the south of Europe than in Scotland . Still , these facts , properly understood , do not invalidate ...
Pagina 108
... region . It is rich in fossils , and these have been thoroughly studied and admirably illustrated by the New York and Canadian Surveys . 3. The rocks of this area surround the basin of Lake Erie , and were named , in the original ...
... region . It is rich in fossils , and these have been thoroughly studied and admirably illustrated by the New York and Canadian Surveys . 3. The rocks of this area surround the basin of Lake Erie , and were named , in the original ...
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Termeni și expresii frecvente
abundant Acrogens aërial roots Algæ allied America animal appear arctic areoles bark beds belong bituminous branches Brongniart Calamites Canada carbon Carboniferous Caulopteris cellular character clay climate coal coal-formation conifers Cordaites cycads Dadoxylon Dawson deposits described Devonian diameter dicotyledonous Eocene Europe exogenous fact ferns flora formation forms fossil fossil plants fronds fructification fruit Gaspé genera genus Geological Society graphite Greenland gymnospermous Heer hemisphere Journal known land land-plants Laramie Laurentian leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores matter medullary rays Mesozoic Miocene modern Nematophyton northern Nova Scotia occur outer Palæozoic period Permian pines pinnules pith present preserved probably Prof Psilophyton referred remarkable resemble Rhizocarps rocks sandstones scalariform scars Sequoia shales Sigillaria Silurian similar species specimens Sphenophyllum Sporangites spore-cases spores sporocarps stems Sternbergia structure surface Tertiary thick tion tissue tree-ferns trees trunks types Upper Cretaceous vascular vegetable wood woody