The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 8
... representing perhaps the earliest rocks produced after our earth had ceased to be a molten mass , are the hard , crys- talline , and much - contorted rocks named by the late Sir W. E. Logan Laurentian , and which are largely developed ...
... representing perhaps the earliest rocks produced after our earth had ceased to be a molten mass , are the hard , crys- talline , and much - contorted rocks named by the late Sir W. E. Logan Laurentian , and which are largely developed ...
Pagina 22
... represented in Figs . 2 , 3 , 4 , with the débris 000 g FIG . 3. - Nematophyton Logani ( magnified ) . Horizontal section , showing part of one of the radial spaces , with tubes passing into it . of fossil taxine woods , mineralised ...
... represented in Figs . 2 , 3 , 4 , with the débris 000 g FIG . 3. - Nematophyton Logani ( magnified ) . Horizontal section , showing part of one of the radial spaces , with tubes passing into it . of fossil taxine woods , mineralised ...
Pagina 27
... representing their organic matter , and this is the more likely to occur in their case , as organic matters buried in marine deposits and not exposed to atmospheric oxidation are very likely to be preserved . 2. In the absence of ...
... representing their organic matter , and this is the more likely to occur in their case , as organic matters buried in marine deposits and not exposed to atmospheric oxidation are very likely to be preserved . 2. In the absence of ...
Pagina 36
... represents a broader and more frondose type of distinctly carbonaceous character . It may be described as follows : Buthotrephis Grantii , S. N. ( Fig . 13 ) .- Stems and * Appendix , p . 676 , edition of 1878 . fronds smooth and ...
... represents a broader and more frondose type of distinctly carbonaceous character . It may be described as follows : Buthotrephis Grantii , S. N. ( Fig . 13 ) .- Stems and * Appendix , p . 676 , edition of 1878 . fronds smooth and ...
Pagina 42
... , but tortuous . On the external surface of some specimens these radial spaces are represented by minute pits irregu- larly or spirally arranged . The transverse swellings of the 42 THE GEOLOGICAL HISTORY OF PLANTS .
... , but tortuous . On the external surface of some specimens these radial spaces are represented by minute pits irregu- larly or spirally arranged . The transverse swellings of the 42 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