The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
Din interiorul cărții
Rezultatele 1 - 5 din 16
Pagina 9
... organic matter . Besides this , certain forms known as Eozoon Canadense have been recognised in the Laurentian lime- stones , which indicate the presence at least of one of the lower types of marine animals . Where animal life is , we ...
... organic matter . Besides this , certain forms known as Eozoon Canadense have been recognised in the Laurentian lime- stones , which indicate the presence at least of one of the lower types of marine animals . Where animal life is , we ...
Pagina 12
... organic re- mains we are more familiar than with those of the Lau- rentian , there is no other source of unoxidized carbon in rocks than that furnished by organic matter , and that this has obtained its carbon in all cases , in the ...
... organic re- mains we are more familiar than with those of the Lau- rentian , there is no other source of unoxidized carbon in rocks than that furnished by organic matter , and that this has obtained its carbon in all cases , in the ...
Pagina 13
... organic matter must have been thoroughly disin- tegrated and bituminised before it was changed into graphite . This would also give a probability that the vegetation implied was aquatic , or at least that it was accumulated under water ...
... organic matter must have been thoroughly disin- tegrated and bituminised before it was changed into graphite . This would also give a probability that the vegetation implied was aquatic , or at least that it was accumulated under water ...
Pagina 14
... organic structure remains . It is true that , in certain bituminous shales and limestones of the Silurian system , shreds of organic tissue can sometimes be detected , and in some cases , as in the Lower Silurian limestone of the La ...
... organic structure remains . It is true that , in certain bituminous shales and limestones of the Silurian system , shreds of organic tissue can sometimes be detected , and in some cases , as in the Lower Silurian limestone of the La ...
Pagina 15
... organic tissues may be found in the Laurentian graphite , if formed from land - plants , more especially if any plants existed at that time having true woody or vascular tissues ; but it cannot with certainty be affirmed that such ...
... organic tissues may be found in the Laurentian graphite , if formed from land - plants , more especially if any plants existed at that time having true woody or vascular tissues ; but it cannot with certainty be affirmed that such ...
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