The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 9
... regarded as exceptional or rare , but is widely dis- tributed and of large amount . In Canada more especially the deposits are very considerable . The graphite of the Laurentian of Canada occurs both in beds and in veins , and in such a ...
... regarded as exceptional or rare , but is widely dis- tributed and of large amount . In Canada more especially the deposits are very considerable . The graphite of the Laurentian of Canada occurs both in beds and in veins , and in such a ...
Pagina 13
... regarded by Loga and Hunt as an altered bitumen . These paleozoic anal gies would lead us to infer that the larger part of t Laurentian graphite falls under the second class of d posits above mentioned , and that , if of vegetable origi ...
... regarded by Loga and Hunt as an altered bitumen . These paleozoic anal gies would lead us to infer that the larger part of t Laurentian graphite falls under the second class of d posits above mentioned , and that , if of vegetable origi ...
Pagina 14
... regarded injections , sometimes of much beauty . In cor with this , while in some Laurentian graphitic for instance , in the compact graphite of Cla carbon presents a curdled appearance due to s and precisely similar to that of the ...
... regarded injections , sometimes of much beauty . In cor with this , while in some Laurentian graphitic for instance , in the compact graphite of Cla carbon presents a curdled appearance due to s and precisely similar to that of the ...
Pagina 25
... regarded as mere spores . They should perhaps constitute a separate class or order to which the name Nematodendreæ may be given , and of which Nematophyton will constitute one genus and Aporoxylon of Unger another . * Another question ...
... regarded as mere spores . They should perhaps constitute a separate class or order to which the name Nematodendreæ may be given , and of which Nematophyton will constitute one genus and Aporoxylon of Unger another . * Another question ...
Pagina 26
... regarded as conjectural . We seem , how- ever , to have here a type of tree very dissimilar to any even of the later Palæozoic age , which existed through- out the Silurian , and probably further back , which ceased to exist early in ...
... regarded as conjectural . We seem , how- ever , to have here a type of tree very dissimilar to any even of the later Palæozoic age , which existed through- out the Silurian , and probably further back , which ceased to exist early in ...
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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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