The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 6
... Arctic forms . It is evi in those periods when the continental area submerged , there might be an excessive am ure in the atmosphere , greatly modifying t so far as plants are concerned . Let us now consider the history of the v dom as ...
... Arctic forms . It is evi in those periods when the continental area submerged , there might be an excessive am ure in the atmosphere , greatly modifying t so far as plants are concerned . Let us now consider the history of the v dom as ...
Pagina 103
... Arctic than in the temperate zone . Hence an Arctic or American flora , really Devonian , may readily be mistaken for Lower Carboniferous by a botanist basing his calculations on the fossils of temperate Europe . Even in America itself ...
... Arctic than in the temperate zone . Hence an Arctic or American flora , really Devonian , may readily be mistaken for Lower Carboniferous by a botanist basing his calculations on the fossils of temperate Europe . Even in America itself ...
Pagina 134
... Arctic zone , the last trees . that can struggle against the unfavourable conditions of existence are the spruces and firs , and in the warm and moist islands of the tropics they seem equally at home with the tree - ferns and the palms ...
... Arctic zone , the last trees . that can struggle against the unfavourable conditions of existence are the spruces and firs , and in the warm and moist islands of the tropics they seem equally at home with the tree - ferns and the palms ...
Pagina 187
... Arctic zone , and have been described and figured in the " Fossil Flora of the Arctic Regions . " Sequoia has been recognised by Ettingshausen even in Australia , but there in the Eocene . This is , perhaps , the most remarkable record ...
... Arctic zone , and have been described and figured in the " Fossil Flora of the Arctic Regions . " Sequoia has been recognised by Ettingshausen even in Australia , but there in the Eocene . This is , perhaps , the most remarkable record ...
Pagina 207
... Arctic circle , and it would seem to have become warmer toward the close of the period . The flora of the Cenomanian is separated in most countries from that of the Senonian , or uppermost Cre- taceous , by a marine formation holding ...
... Arctic circle , and it would seem to have become warmer toward the close of the period . The flora of the Cenomanian is separated in most countries from that of the Senonian , or uppermost Cre- taceous , by a marine formation holding ...
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Termeni și expresii frecvente
acrogens aërial roots Algæ allied America appear arctic areoles bark beds belong bituminous branches Brongniart bundles Calamites Canada Carboniferous Caulopteris cells cellular character climate coal coal-formation conifers Cordaites cycads cylinder Dadoxylon Dawson Demy 8vo described Devonian diameter Eocene Erian Europe exogenous Fcap ferns flora formation forms fossil plants fronds fructification fruit Gaspé genera genus Geological Society graphite Greenland hemisphere Illustrations Journal Laramie Laurentian leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores medullary rays Mesozoic Middle modern Nova Scotia occur outer Paleozoic period Permian petioles pines pinnate pinnules pith present probably Prof Psilophyton referred resemble Rhizocarps ribbed rocks sandstones scalariform scars Second Edition Sequoia shales Sigillaria Silurian similar Small crown 8vo species specimens Sphenophyllum Sporangites spore-cases spores sporocarps stems Sternbergia structure Tertiary thick Third Edition tion tissue tree-ferns trees trunks Upper Cretaceous vascular vegetable vols Williamson wood woody
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