The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 3
... observed that in some single exposures or series of exposures , like those in the great cañons of Colorado , or on the coasts of Great Britain , we can often in one locality see nearly the whole sequence of beds . Let us observe here ...
... observed that in some single exposures or series of exposures , like those in the great cañons of Colorado , or on the coasts of Great Britain , we can often in one locality see nearly the whole sequence of beds . Let us observe here ...
Pagina 4
... observed , since only the late tems of formations in this table belongs to human history , that the whole lapse of tim the table must be enormous . If we suppos period to have continued for say ten thousa each of the others to have been ...
... observed , since only the late tems of formations in this table belongs to human history , that the whole lapse of tim the table must be enormous . If we suppos period to have continued for say ten thousa each of the others to have been ...
Pagina 13
... observed ars to be occupied es , and that rich ation of this sys- rocks believed to swick , there is a d associated with ng an aggregate e present world , cose organic re- ose of the Lau- lized carbon in atter , and that in the first in ...
... observed ars to be occupied es , and that rich ation of this sys- rocks believed to swick , there is a d associated with ng an aggregate e present world , cose organic re- ose of the Lau- lized carbon in atter , and that in the first in ...
Pagina 14
... observed , h when , in more modern sediments , Algæ ha verted into bituminous matter , we cannot o tain any structural evidence of the origin of su and in the graphitic slates and limestones the metamorphosis of such rocks no organ ...
... observed , h when , in more modern sediments , Algæ ha verted into bituminous matter , we cannot o tain any structural evidence of the origin of su and in the graphitic slates and limestones the metamorphosis of such rocks no organ ...
Pagina 18
... observed in the development of other plants in primitive geological times ; and a little later in this his- tory we shall see that there is evidence in the flora of the Silurian of a survival of such forms . It may be that no geologist ...
... observed in the development of other plants in primitive geological times ; and a little later in this his- tory we shall see that there is evidence in the flora of the Silurian of a survival of such forms . It may be that no geologist ...
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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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