The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 8
... America and in many other regions . So numerous and e deed , are the exposures of these rocks , that w reason to believe that they underlie all the tions of our continents , and are even world - w distribution . In the lower part of ...
... America and in many other regions . So numerous and e deed , are the exposures of these rocks , that w reason to believe that they underlie all the tions of our continents , and are even world - w distribution . In the lower part of ...
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 auther 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 auther 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
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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