The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 2
... land , they are not universal , but occur in those places where there were extensive areas of water receiving detritus from the land . Further , as the distinction of land and water arises prima- rily from the shrinkage of the mass of ...
... land , they are not universal , but occur in those places where there were extensive areas of water receiving detritus from the land . Further , as the distinction of land and water arises prima- rily from the shrinkage of the mass of ...
Pagina 3
Sir John William Dawson. basins , ridges of elevated land , and broad plateaus inter- vening between the ridges , and which were at some times under water , and at other times land , with many inter- mediate phases . The settlement and ...
Sir John William Dawson. basins , ridges of elevated land , and broad plateaus inter- vening between the ridges , and which were at some times under water , and at other times land , with many inter- mediate phases . The settlement and ...
Pagina 5
... land and water which have occurred , we shall see that such changes must have produced very great differences of climate . The warm equatorial waters have in all periods , as superficial oceanic currents , been main agents in the ...
... land and water which have occurred , we shall see that such changes must have produced very great differences of climate . The warm equatorial waters have in all periods , as superficial oceanic currents , been main agents in the ...
Pagina 8
... 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 the later geological formations ...
... 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 the later geological formations ...
Pagina 14
... be tubes of Eozoon penetrated by matter once bituminous , but now in the state of graphite . * " Geology of Canada , " 1863 . When paleozoic land - plants have been converted into graphite 14 THE GEOLOGICAL HISTORY OF PLANTS .
... be tubes of Eozoon penetrated by matter once bituminous , but now in the state of graphite . * " Geology of Canada , " 1863 . When paleozoic land - plants have been converted into graphite 14 THE GEOLOGICAL HISTORY OF PLANTS .
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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