The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 9
... shales have been converted into graphitic shales , and that cracks filled with soft bituminous matter have ultimately become changed into veins of graphite . When , therefore , we find in the Lau- rentian thick beds of graphite and beds ...
... shales have been converted into graphitic shales , and that cracks filled with soft bituminous matter have ultimately become changed into veins of graphite . When , therefore , we find in the Lau- rentian thick beds of graphite and beds ...
Pagina 10
... the bedded rocks traversed by these veins , to which it bears the same relation with the veins * " ' Geology of Canada , " 1863 . of bitumen found in the bituminous shales of the Car- 10 THE GEOLOGICAL HISTORY OF PLANTS .
... the bedded rocks traversed by these veins , to which it bears the same relation with the veins * " ' Geology of Canada , " 1863 . of bitumen found in the bituminous shales of the Car- 10 THE GEOLOGICAL HISTORY OF PLANTS .
Pagina 11
Sir John William Dawson. of bitumen found in the bituminous shales of the Car- boniferous and Silurian rocks . Nor can there be any doubt that the graphite found in the beds has been de- posited along with the calcareous matter or muddy ...
Sir John William Dawson. of bitumen found in the bituminous shales of the Car- boniferous and Silurian rocks . Nor can there be any doubt that the graphite found in the beds has been de- posited along with the calcareous matter or muddy ...
Pagina 12
... shales and bituminous and oil - bearing limestones . The beds of graphite near St. John , some of those in the gneiss at Ticonderoga in New York , and at Lochaber and Buckingham , and else- where in Canada , are so pure and regular that ...
... shales and bituminous and oil - bearing limestones . The beds of graphite near St. John , some of those in the gneiss at Ticonderoga in New York , and at Lochaber and Buckingham , and else- where in Canada , are so pure and regular that ...
Pagina 13
... shales . Such bituminous veins occur in the Lower Carboniferous limestone and shale of Dorchester and Hillsborough , New Brunswick , with an arrangement very similar to that of the veins of graphite ; and in the Que- bec rocks of Point ...
... shales . Such bituminous veins occur in the Lower Carboniferous limestone and shale of Dorchester and Hillsborough , New Brunswick , with an arrangement very similar to that of the veins of graphite ; and in the Que- bec rocks of Point ...
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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