The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
Din interiorul cărții
Rezultatele 1 - 5 din 43
Pagina 5
... climate . The warm equatorial waters have in all periods , as superficial oceanic currents , been main agents in the diffusion of heat over the surface of the earth , and their distribution to north and south must have been determined ...
... climate . The warm equatorial waters have in all periods , as superficial oceanic currents , been main agents in the diffusion of heat over the surface of the earth , and their distribution to north and south must have been determined ...
Pagina 6
... climate , in so far as plants are concerned . Let us now consider the history of the vegetable king- dom as indicated in the few notes in the right - hand . column of the table . The most general subdivision of plants is into the two ...
... climate , in so far as plants are concerned . Let us now consider the history of the vegetable king- dom as indicated in the few notes in the right - hand . column of the table . The most general subdivision of plants is into the two ...
Pagina 7
... climates belong to this group . On referring to the geological table , it will be seen that there is a certain rough correspondence between the order of rank of plants and the order of their appearance in time . The oldest plants that ...
... climates belong to this group . On referring to the geological table , it will be seen that there is a certain rough correspondence between the order of rank of plants and the order of their appearance in time . The oldest plants that ...
Pagina 17
... climate and atmosphere of the Laurentian may have been well adapted for the sustenance of vegetable life . We can scarcely doubt that the internal heat of the earth still warmed the waters of the sea , and these warm waters must have ...
... climate and atmosphere of the Laurentian may have been well adapted for the sustenance of vegetable life . We can scarcely doubt that the internal heat of the earth still warmed the waters of the sea , and these warm waters must have ...
Pagina 47
... climate that seems to have characterised this period , were admirably suited to nourish a luxuriant vegetation . Under this mild climate , also , it would seem that new forms of plants were first introduced in the far north , where the ...
... climate that seems to have characterised this period , were admirably suited to nourish a luxuriant vegetation . Under this mild climate , also , it would seem that new forms of plants were first introduced in the far north , where the ...
Alte ediții - Afișează-le pe toate
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