The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 2
... contain ; all these appearances indicating that each successive 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 ...
... contain ; all these appearances indicating that each successive 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 ...
Pagina 6
... containing an embryo of the future plant . The Cryptogams may be subdivided into the following three groups : 1. Thallogens , cellular plants not distinctly distin- guishable into stem and leaf . These are the Fungi , the Lichens , and ...
... containing an embryo of the future plant . The Cryptogams may be subdivided into the following three groups : 1. Thallogens , cellular plants not distinctly distin- guishable into stem and leaf . These are the Fungi , the Lichens , and ...
Pagina 9
... Canada occurs both in beds and in veins , and in such a manner as to show that its origin and deposition are contemporaneous with 66 those of the containing rock . Sir William Logan 3 LAURENTIAN AND EARLY PALEOZOIC . 9.
... Canada occurs both in beds and in veins , and in such a manner as to show that its origin and deposition are contemporaneous with 66 those of the containing rock . Sir William Logan 3 LAURENTIAN AND EARLY PALEOZOIC . 9.
Pagina 10
Sir John William Dawson. 66 those of the containing rock . Sir William Logan states * that " the deposits of plumbago generally occur in the limestones or in their immediate vicinity , and granular varieties of the rock often contain ...
Sir John William Dawson. 66 those of the containing rock . Sir William Logan states * that " the deposits of plumbago generally occur in the limestones or in their immediate vicinity , and granular varieties of the rock often contain ...
Pagina 11
... contain in all a less vertical thickness of pure graphite than from twenty to thirty feet . In the adjoining township of Lochaber Sir W. E. Logan notices . a band from twenty - five to thirty feet thick , reticulated with graphite veins ...
... contain in all a less vertical thickness of pure graphite than from twenty to thirty feet . In the adjoining township of Lochaber Sir W. E. Logan notices . a band from twenty - five to thirty feet thick , reticulated with graphite veins ...
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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