The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 2
... indicating that each successive bed must have been the 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 ...
... indicating that each successive bed must have been the 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 ...
Pagina 3
... indicated by the beds themselves . The facts as to the sequence we obtain from the study of ex- posures in cliffs , cuttings , quarries , and mines ; and by correlating these local sections in a great number of places , we obtain our ...
... indicated by the beds themselves . The facts as to the sequence we obtain from the study of ex- posures in cliffs , cuttings , quarries , and mines ; and by correlating these local sections in a great number of places , we obtain our ...
Pagina 6
... indicated in the few notes in the right - hand . column of the table . The most general subdivision of plants is into the two great series of Cryptogams , or those which have no mani- fest flowers , and produce minute spores instead of ...
... indicated in the few notes in the right - hand . column of the table . The most general subdivision of plants is into the two great series of Cryptogams , or those which have no mani- fest flowers , and produce minute spores instead of ...
Pagina 8
... indicate that there were already land and water , and that the waters and possibly the land were already tenanted by living beings . The great beds of limestone which exist in this part of the system furnish one indication of this . In ...
... indicate that there were already land and water , and that the waters and possibly the land were already tenanted by living beings . The great beds of limestone which exist in this part of the system furnish one indication of this . In ...
Pagina 9
... indicate the presence at least of one of the lower types of marine animals . Where animal life is , we may fairly infer the existence of vegetable life as well , since the plant is the only producer of food for the ani- mal . But we are ...
... indicate the presence at least of one of the lower types of marine animals . Where animal life is , we may fairly infer the existence of vegetable life as well , since the plant is the only producer of food for the ani- mal . But we are ...
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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