The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 2
... matter ; and that he can only hope to sketch the present aspect of the subject , and to point the way to new developments , which must go on long after he shall have passed away . The subject is one which has the disadvantage of pre ...
... matter ; and that he can only hope to sketch the present aspect of the subject , and to point the way to new developments , which must go on long after he shall have passed away . The subject is one which has the disadvantage of pre ...
Pagina 8
... directly from their food , and indirectly from the calcareous matter dissolved in the sea - water . In like manner great beds of iron - ore exist in the CHAPTER II VEGETATION OF THE LAURENTIAN AND EARLY PALEOZOIC-QUESTIONS AS TO ALGE.
... directly from their food , and indirectly from the calcareous matter dissolved in the sea - water . In like manner great beds of iron - ore exist in the CHAPTER II VEGETATION OF THE LAURENTIAN AND EARLY PALEOZOIC-QUESTIONS AS TO ALGE.
Pagina 9
... matter . Besides this , certain forms known as Eozoon Canadense have been recognised in the Laurentian lime- stones ... matter , and we know that these have arisen from the accumulation and slow putrefaction of masses of vegetable matter ...
... matter . Besides this , certain forms known as Eozoon Canadense have been recognised in the Laurentian lime- stones ... matter , and we know that these have arisen from the accumulation and slow putrefaction of masses of vegetable matter ...
Pagina 11
... matter or muddy and sandy sediment of which these beds were originally com- posed . * The quantity of graphite in the Lower Laurentian series is enormous . Some years ago , in the township of Buckingham , on the Ottawa River , I ...
... matter or muddy and sandy sediment of which these beds were originally com- posed . * The quantity of graphite in the Lower Laurentian series is enormous . Some years ago , in the township of Buckingham , on the Ottawa River , I ...
Pagina 12
... matter of the Laurentian has been accumulated in beds like those of coal , or that it has consisted of diffused bituminous matter similar to that in more modern bituminous shales and bituminous and oil - bearing limestones . The beds of ...
... matter of the Laurentian has been accumulated in beds like those of coal , or that it has consisted of diffused bituminous matter similar to that in more modern bituminous shales and bituminous and oil - bearing limestones . The beds of ...
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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