The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 2
... bed must have been the surface before it was covered by the next . As these beds of rock were mostly formed under water , and of material derived from the waste of land , they are not universal , but occur in those places where there ...
... bed must have been the surface before it was covered by the next . As these beds of rock were mostly formed under water , and of material derived from the waste of land , they are not universal , but occur in those places where there ...
Pagina 3
... beds , more especially of those deposited in the times of continental submer- gence , we obtain a table of geological chronology which expresses the several stages of the formation of the earth's crust , from that early time when a ...
... beds , more especially of those deposited in the times of continental submer- gence , we obtain a table of geological chronology which expresses the several stages of the formation of the earth's crust , from that early time when a ...
Pagina 8
... beds of limestone which exist in this part of the system furnish one indication of this . In the later geological formations the limestones are mostly or- ganic - that is , they consist of accumulated remains of shells , corals , and ...
... beds of limestone which exist in this part of the system furnish one indication of this . In the later geological formations the limestones are mostly or- ganic - that is , they consist of accumulated remains of shells , corals , and ...
Pagina 9
Sir John William Dawson. manner great beds of iron - ore exist in the Laurentian ; but in later formations the determining cause of the accumulation of such beds is the partial deoxidation and solution of the peroxide of iron by the ...
Sir John William Dawson. manner great beds of iron - ore exist in the Laurentian ; but in later formations the determining cause of the accumulation of such beds is the partial deoxidation and solution of the peroxide of iron by the ...
Pagina 11
... beds has been de- posited along with the calcareous 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 ...
... beds has been de- posited along with the calcareous 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 ...
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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