The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 3
... sometimes dry and sometimes sub- merged , and deep ocean - basins , never except in some of their shallower portions elevated into land . By the study of the successive beds , more especially of those deposited in the times of ...
... sometimes dry and sometimes sub- merged , and deep ocean - basins , never except in some of their shallower portions elevated into land . By the study of the successive beds , more especially of those deposited in the times of ...
Pagina 10
... sometimes in quartzite and in feldspathic rocks , or even in magnetic oxide of iron . " In addition to these bedded forms , there are also true veins in which graphite occurs associated with cal- cite , quartz , orthoclase , or pyroxene ...
... sometimes in quartzite and in feldspathic rocks , or even in magnetic oxide of iron . " In addition to these bedded forms , there are also true veins in which graphite occurs associated with cal- cite , quartz , orthoclase , or pyroxene ...
Pagina 14
... sometimes be detected , and in some cases , as in the Lower Silurian limestone of the La Cloche Mount- ains in Canada , the pores of brachiopodous shells and the cells of corals have been penetrated by black bitu- minous matter ...
... sometimes be detected , and in some cases , as in the Lower Silurian limestone of the La Cloche Mount- ains in Canada , the pores of brachiopodous shells and the cells of corals have been penetrated by black bitu- minous matter ...
Pagina 15
... sometimes perfectly retain their structure . Mineral charcoal , with structure , exists in the graphitic . coal of Rhode Island . The fronds of ferns , with their minutest veins perfect , are preserved in the Devonian shales of St. John ...
... sometimes perfectly retain their structure . Mineral charcoal , with structure , exists in the graphitic . coal of Rhode Island . The fronds of ferns , with their minutest veins perfect , are preserved in the Devonian shales of St. John ...
Pagina 28
... sometimes named Bilo- bites . in 1862 , to correspond precisely with those of the American Limulus ( Poly- phemus Occidentalis ) ( Fig . 5 ) . I proved by experi- ment with the modern ani- mal that the recurring se- ries of groups of ...
... sometimes named Bilo- bites . in 1862 , to correspond precisely with those of the American Limulus ( Poly- phemus Occidentalis ) ( Fig . 5 ) . I proved by experi- ment with the modern ani- mal that the recurring se- ries of groups 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