The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 2
... surface before it was covered by the next . As these beds of rock were mostly formed under water , and of material derived from the waste of land , they are not universal , but occur in those places where there were extensive areas of ...
... surface before it was covered by the next . As these beds of rock were mostly formed under water , and of material derived from the waste of land , they are not universal , but occur in those places where there were extensive areas of ...
Pagina 4
... surface of the ground . Let us now tabulate the whole geological succession with the history of animals and plants associated with it : ANIMALS . SYSTEMS OF FORMATIONS . PLANTS . Age of Man and Mammalia . Age of Reptiles . Age of ...
... surface of the ground . Let us now tabulate the whole geological succession with the history of animals and plants associated with it : ANIMALS . SYSTEMS OF FORMATIONS . PLANTS . Age of Man and Mammalia . Age of Reptiles . Age of ...
Pagina 5
... surface of the earth , and their distribution to north and south must have been determined mainly by the extent and direction of land , though it may also have been modified by the changes in the astronomical relations and period of the ...
... surface of the earth , and their distribution to north and south must have been determined mainly by the extent and direction of land , though it may also have been modified by the changes in the astronomical relations and period of the ...
Pagina 24
... surface of the stem smooth or irregularly ribbed , but with a nodose or jointed appearance . Internally , they show a tissue of long , cylin- drical tubes , traversed by a complex network of horizontal tubes thinner walled and of ...
... surface of the stem smooth or irregularly ribbed , but with a nodose or jointed appearance . Internally , they show a tissue of long , cylin- drical tubes , traversed by a complex network of horizontal tubes thinner walled and of ...
Pagina 25
... surface - markings , though , as we have seen , it had bundles of tubes passing diagonally to the surface . These plants were more probably trees with an axis of barred vessels and thick , cellular bark , like the Lepidodendron of later ...
... surface - markings , though , as we have seen , it had bundles of tubes passing diagonally to the surface . These plants were more probably trees with an axis of barred vessels and thick , cellular bark , like the Lepidodendron of later ...
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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