The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 8
... America and Europe , and in many other 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 ...
... America and Europe , and in many other 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 ...
Pagina 20
... America , Lesquereux has found some minute radiated leaves , referred by him to the genus Sphenophyllum , † which is also allied to Rhizocarps . Still more remarkable is the discovery in the same beds of a stem with rhombic areoles or ...
... America , Lesquereux has found some minute radiated leaves , referred by him to the genus Sphenophyllum , † which is also allied to Rhizocarps . Still more remarkable is the discovery in the same beds of a stem with rhombic areoles or ...
Pagina 46
... America for illustration of the physical condi- tions of the time . In a physical point of view the north- ern hemisphere presented a great change in the Erian . period . There were vast foldings of the crust of the earth , and great ...
... America for illustration of the physical condi- tions of the time . In a physical point of view the north- ern hemisphere presented a great change in the Erian . period . There were vast foldings of the crust of the earth , and great ...
Pagina 47
... America of this Erian age consisted during the greater part of the period of a more or less extensive belt of land in the north with two long tongues descending from it , one along the Appalachian line in the east , the other in the ...
... America of this Erian age consisted during the greater part of the period of a more or less extensive belt of land in the north with two long tongues descending from it , one along the Appalachian line in the east , the other in the ...
Pagina 67
... the author on “ Devonian Plants , " " Geological Survey of Canada , " which see for details as to Erian Flora of northeastern America . many palæo - botanists have referred to the Marsiliacæ , THE ERIAN OR DEVONIAN FORESTS . 67.
... the author on “ Devonian Plants , " " Geological Survey of Canada , " which see for details as to Erian Flora of northeastern America . many palæo - botanists have referred to the Marsiliacæ , THE ERIAN OR DEVONIAN FORESTS . 67.
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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