The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
Din interiorul cărții
Rezultatele 1 - 5 din 36
Pagina 11
... doubt that the graphite found in the beds has been de- posited along with the calcareous matter or muddy and sandy sediment of which these beds were originally com- posed . * The quantity of graphite in the Lower Laurentian series is ...
... doubt that the graphite found in the beds has been de- posited along with the calcareous matter or muddy and sandy sediment of which these beds were originally com- posed . * The quantity of graphite in the Lower Laurentian series is ...
Pagina 14
... doubt of later date than the Laurentian rocks themselves . It would be very desirable to confirm such conclusions as those above deduced by the evidence of actual micro- scopic structure . It is to be observed , however , that when , in ...
... doubt of later date than the Laurentian rocks themselves . It would be very desirable to confirm such conclusions as those above deduced by the evidence of actual micro- scopic structure . It is to be observed , however , that when , in ...
Pagina 17
... doubt that the internal heat of the earth still warmed the waters of the sea , and these warm waters must have diffused great quantities of mists and vapours over the land , giving a moist and equable if not a very clear atmosphere ...
... doubt that the internal heat of the earth still warmed the waters of the sea , and these warm waters must have diffused great quantities of mists and vapours over the land , giving a moist and equable if not a very clear atmosphere ...
Pagina 24
... doubt , from its mode of occurrence ; that it was of dura- ble and resisting character is shown by its state of preser- vation ; and the structure of the seeds called Pachytheca , with their constant association with these trees , give ...
... doubt , from its mode of occurrence ; that it was of dura- ble and resisting character is shown by its state of preser- vation ; and the structure of the seeds called Pachytheca , with their constant association with these trees , give ...
Pagina 35
... doubt , in most cases the results of the pressure and consolidation of the clay around small solid bodies , whether organic , fragmentary , or concre- tionary . They are , in short , local slickensides precisely similar to those found ...
... doubt , in most cases the results of the pressure and consolidation of the clay around small solid bodies , whether organic , fragmentary , or concre- tionary . They are , in short , local slickensides precisely similar to those found ...
Alte ediții - Afișează-le pe toate
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