The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 2
... bed must have been the su was covered by the next . As these beds of rock were mostly formed and of material derived from the waste of not universal , but occur in those places whe extensive areas of water receiving detritus f Further ...
... bed must have been the su was covered by the next . As these beds of rock were mostly formed and of material derived from the waste of not universal , but occur in those places whe extensive areas of water receiving detritus f Further ...
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 e part of the system furnish one indication of t later geological formations the limestones ar ganic - that is , they consist of accumulated shells , corals , and other hard parts of mari which are composed of ...
... beds of limestone which e part of the system furnish one indication of t later geological formations the limestones ar ganic - that is , they consist of accumulated shells , corals , and other hard parts of mari which are composed of ...
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
Acrogens aërial roots Algæ allied America appear Archæopteris arctic areoles bark beds belong bituminous branches Brongniart bundles Calamites Canada Carboniferous Caulopteris cellular character clay climate coal coal-formation cones conifers Cordaites cycads cylinder Dadoxylon Dawson Demy 8vo deposits described Devonian dicotyledonous Eocene Erian Europe exogenous Fcap ferns flora formation forms fossil plants fronds fructification fruit Gaspé genera genus Geological Society Greenland Heer hemisphere Illustrations land Laramie leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores medullary rays Mesozoic Middle Miocene modern northern Nova Scotia occur outer Palæozoic period Permian pines pinnules pith present probably Prof Psilophyton referred resemble Rhizocarps ribbed rocks sandstones scalariform Sequoia shales Sigillaria Silurian similar Small crown 8vo species specimens Sphenophyllum Sphenopteris Sporangites spore-cases spores sporocarps stems Sternbergia structure Tertiary thick tion tissue transverse tree-ferns trees trunks types Upper Cretaceous vascular scar vegetable wood woody
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