The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 10
... resemble strings of nodular masses . It is most probable that the graphite of the veins was originally introduced as a liquid or plastic hydrocarbon ; but in whatever way introduced , the char- acter of the veins indicates that in the ...
... resemble strings of nodular masses . It is most probable that the graphite of the veins was originally introduced as a liquid or plastic hydrocarbon ; but in whatever way introduced , the char- acter of the veins indicates that in the ...
Pagina 26
... resemble in form plants of this kind still existing ; and , since their simple cellular structures and soft tissues are scarcely ever preserved , their general forms are all that we can know , so that their exact resemblance to or ...
... resemble in form plants of this kind still existing ; and , since their simple cellular structures and soft tissues are scarcely ever preserved , their general forms are all that we can know , so that their exact resemblance to or ...
Pagina 31
... resemble the so- called Eophyton , described by Torell from the Primordial of Sweden , and by Billings from that of Newfound- land ; and which also occur abun- dantly in the Primordial of New Brunswick . After examining a se- ries of ...
... resemble the so- called Eophyton , described by Torell from the Primordial of Sweden , and by Billings from that of Newfound- land ; and which also occur abun- dantly in the Primordial of New Brunswick . After examining a se- ries of ...
Pagina 32
... resemble some of the grooves in Silurian rocks which have been referred to trails of Gasteropods , as , for instance , those from the Clinton group , described by Hall . Another kind of markings not even organic , but alto- gether ...
... resemble some of the grooves in Silurian rocks which have been referred to trails of Gasteropods , as , for instance , those from the Clinton group , described by Hall . Another kind of markings not even organic , but alto- gether ...
Pagina 33
... resemble roots , fucoids allied to Buthotrephis , or the ra- diating worm - burrows already re- ferred to ( Fig . 10 ) . Shrinkage - cracks are also abun- dant in some of the Carboniferous beds , and are sometimes accom- panied with ...
... resemble roots , fucoids allied to Buthotrephis , or the ra- diating worm - burrows already re- ferred to ( Fig . 10 ) . Shrinkage - cracks are also abun- dant in some of the Carboniferous beds , and are sometimes accom- panied with ...
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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