The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 8
... northern parts of North America and Europe , and in many other regions . So numerous and extensive , in- deed , are the exposures of these rocks , that we have good reason to believe that they underlie all the other forma- tions of our ...
... northern parts of North America and Europe , and in many other regions . So numerous and extensive , in- deed , are the exposures of these rocks , that we have good reason to believe that they underlie all the other forma- tions of our ...
Pagina 48
... northern latitudes . Of this latter fact a remarkable example is afforded by the beds holding plants of this age in Spitz- bergen and Bear Island , in its vicinity . Here there seem to be two series of plant - bearing strata , one with ...
... northern latitudes . Of this latter fact a remarkable example is afforded by the beds holding plants of this age in Spitz- bergen and Bear Island , in its vicinity . Here there seem to be two series of plant - bearing strata , one with ...
Pagina 57
... northern outlier of the great belt of Erian shales referred to by Prof. Orton , and which extends , with a breadth of ten to twenty miles , and of great thickness , across the State of Ohio , for nearly two hundred miles . This Ohio ...
... northern outlier of the great belt of Erian shales referred to by Prof. Orton , and which extends , with a breadth of ten to twenty miles , and of great thickness , across the State of Ohio , for nearly two hundred miles . This Ohio ...
Pagina 108
... Northern States of the Union and western Canada for nearly seven hundred miles , while it spreads from north to south from the northern part of Michigan far into the Middle States , is undoubtedly the most important Devonian area now ...
... Northern States of the Union and western Canada for nearly seven hundred miles , while it spreads from north to south from the northern part of Michigan far into the Middle States , is undoubtedly the most important Devonian area now ...
Pagina 109
... northern latitude , in which ( for reasons stated in my " Report on the Devo- nian Flora ” * ) I believe the Devonian plants to have originated , there was an actual intermixture of the two floras . In America , at the base of the ...
... northern latitude , in which ( for reasons stated in my " Report on the Devo- nian Flora ” * ) I believe the Devonian plants to have originated , there was an actual intermixture of the two floras . In America , at the base of the ...
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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