The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 5
... probably extends from a period wher the earth was intensely heated , its crust thin , and its con tinents as yet unformed , it will be evident that the con ditions of life in the earlier geologic periods may hav been very different from ...
... probably extends from a period wher the earth was intensely heated , its crust thin , and its con tinents as yet unformed , it will be evident that the con ditions of life in the earlier geologic periods may hav been very different from ...
Pagina 20
... probably to Rhizocarps . They consist of slender branching stems , with whorls of elongate and pointed leaves , resembling the genus Annularia of the coal formation . I am inclined to believe that both of Nicholson's species are parts ...
... probably to Rhizocarps . They consist of slender branching stems , with whorls of elongate and pointed leaves , resembling the genus Annularia of the coal formation . I am inclined to believe that both of Nicholson's species are parts ...
Pagina 25
... probably trees with an axis of barred vessels and thick , cellular bark , like the Lepidodendron of later periods , to be noticed in the sequel . Dr. Hicks has also described from the same series of beds which afforded the fragments of ...
... probably trees with an axis of barred vessels and thick , cellular bark , like the Lepidodendron of later periods , to be noticed in the sequel . Dr. Hicks has also described from the same series of beds which afforded the fragments of ...
Pagina 26
... probably further back , which ceased to exist early in the Erian age , and before the appearance of the ordinary coniferous and lepidodendroid trees . May it not have been a survivor of an old arboreal flora extending back even to the ...
... probably further back , which ceased to exist early in the Erian age , and before the appearance of the ordinary coniferous and lepidodendroid trees . May it not have been a survivor of an old arboreal flora extending back even to the ...
Pagina 28
Sir John William Dawson. Owen , and which were by him referred to crustaceans probably resembling Limulus , were shown by the writer , in 1862 , to correspond precisely with those of the American Limulus ( Poly- phemus Occidentalis ) ...
Sir John William Dawson. Owen , and which were by him referred to crustaceans probably resembling Limulus , were shown by the writer , in 1862 , to correspond precisely with those of the American Limulus ( Poly- phemus Occidentalis ) ...
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Termeni și expresii frecvente
acrogens aërial roots Algæ allied America appear arctic areoles bark beds belong bituminous branches Brongniart bundles Calamites Canada Carboniferous Caulopteris cells cellular character climate coal coal-formation conifers Cordaites cycads cylinder Dadoxylon Dawson Demy 8vo described Devonian diameter Eocene Erian Europe exogenous Fcap ferns flora formation forms fossil plants fronds fructification fruit Gaspé genera genus Geological Society graphite Greenland hemisphere Illustrations Journal Laramie Laurentian leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores medullary rays Mesozoic Middle modern Nova Scotia occur outer Paleozoic period Permian petioles pines pinnate pinnules pith present probably Prof Psilophyton referred resemble Rhizocarps ribbed rocks sandstones scalariform scars Second Edition Sequoia shales Sigillaria Silurian similar Small crown 8vo species specimens Sphenophyllum Sporangites spore-cases spores sporocarps stems Sternbergia structure Tertiary thick Third Edition tion tissue tree-ferns trees trunks Upper Cretaceous vascular vegetable vols Williamson wood woody
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