The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 20
... clay by the limbs or tails of some aquatic animal , and afterwards filled up and preserved by succeeding deposits . After examining large series of these specimens from Sweden , and from rocks of similar age in Canada , I confess that I ...
... clay by the limbs or tails of some aquatic animal , and afterwards filled up and preserved by succeeding deposits . After examining large series of these specimens from Sweden , and from rocks of similar age in Canada , I confess that I ...
Pagina 34
... clay or shale above and below , and thus when the mass is broken open we have a car- bonaceous film or thin layer covered with a network of raised lines , and corresponding mi- nute depressed lines on the shale in contact with it . The ...
... clay or shale above and below , and thus when the mass is broken open we have a car- bonaceous film or thin layer covered with a network of raised lines , and corresponding mi- nute depressed lines on the shale in contact with it . The ...
Pagina 35
... clay around small solid bodies , whether organic , fragmentary , or concre- tionary . They are , in short , local slickensides precisely similar to those found so plentifully in the coal under- clays , and which , as I have elsewhere ...
... clay around small solid bodies , whether organic , fragmentary , or concre- tionary . They are , in short , local slickensides precisely similar to those found so plentifully in the coal under- clays , and which , as I have elsewhere ...
Pagina 52
... clays . The Sporangites and their accompaniments in the boulder clay are noticed in a paper by Dr. G. M. Dawson , in the " Bulletin of the Chicago Academy , " June , 1885 . Prof. Clarke has also described , in the " American Journal of ...
... clays . The Sporangites and their accompaniments in the boulder clay are noticed in a paper by Dr. G. M. Dawson , in the " Bulletin of the Chicago Academy , " June , 1885 . Prof. Clarke has also described , in the " American Journal of ...
Pagina 59
... clays , are similar to the macrospores of Salvinia , except that they have a thicker wall and are a little less in diameter , being about one - eightieth of an inch . The Brazilian sporocarps are considerably larger than those of the ...
... clays , are similar to the macrospores of Salvinia , except that they have a thicker wall and are a little less in diameter , being about one - eightieth of an inch . The Brazilian sporocarps are considerably larger than those of the ...
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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