The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 8
... 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 even world ...
... 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 even world ...
Pagina 46
... Europe . Before describing these plants in detail , we may refer to North 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 ...
... Europe . Before describing these plants in detail , we may refer to North 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 ...
Pagina 47
... Europe presented conditions somewhat similar , having in the earlier and middle portions of the period great sea areas with insular patches of land , and later wide tracts of shallow and in part enclosed water areas , swarming with ...
... Europe presented conditions somewhat similar , having in the earlier and middle portions of the period great sea areas with insular patches of land , and later wide tracts of shallow and in part enclosed water areas , swarming with ...
Pagina 54
... Europe , as may be seen by the representation of them in Fig . 16 . B 888 AX AX DX E FIG . 16. - Sporangites ( Protosalvinia ) . A , Sporangites Braziliensis , natural size . Ax , Same , magnified . B , Sp . biloba , natural size . c ...
... Europe , as may be seen by the representation of them in Fig . 16 . B 888 AX AX DX E FIG . 16. - Sporangites ( Protosalvinia ) . A , Sporangites Braziliensis , natural size . Ax , Same , magnified . B , Sp . biloba , natural size . c ...
Pagina 59
... Europe perhaps presents the closest resemblance . In this plant groups of round cellular sporocarps appear at the bases of the floating fronds . They are about a line in diameter when mature , and are of two kinds , one containing ...
... Europe perhaps presents the closest resemblance . In this plant groups of round cellular sporocarps appear at the bases of the floating fronds . They are about a line in diameter when mature , and are of two kinds , one containing ...
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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