The Ancient Life-history of the Earth: A Comprehensive Outline of the Principles and Leading Facts of Palæontological ScienceD. Appleton & Company, 1878 - 407 páginas |
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Página ix
... Chalk , its microscopic structure and mode of formation - Lime- stone , varieties , structure , and origin - Phosphate of lime - Con- cretions - Sulphate of lime - Silica and siliceous deposits of vari- ous kinds - Greensands - Red ...
... Chalk , its microscopic structure and mode of formation - Lime- stone , varieties , structure , and origin - Phosphate of lime - Con- cretions - Sulphate of lime - Silica and siliceous deposits of vari- ous kinds - Greensands - Red ...
Página xv
... Chalk , PAGE 12 13 FIG . 18. Unconformable junction of Chalk and Eocene rocks , PAGE 49 19. Erect trunk of a Sigillaria , 54 13 20. Diagrammatic section of the Laurentian rocks , 21. Microscopic section 3 66 16 17 19 22 23 24 10. Piece ...
... Chalk , PAGE 12 13 FIG . 18. Unconformable junction of Chalk and Eocene rocks , PAGE 49 19. Erect trunk of a Sigillaria , 54 13 20. Diagrammatic section of the Laurentian rocks , 21. Microscopic section 3 66 16 17 19 22 23 24 10. Piece ...
Página 21
... Chalk is a calcareous rock of a generally soft and pulver- ulent texture , and with an earthy fracture . It varies in its purity , being sometimes almost wholly composed of carbonate of lime , and at other times more or less intermixed ...
... Chalk is a calcareous rock of a generally soft and pulver- ulent texture , and with an earthy fracture . It varies in its purity , being sometimes almost wholly composed of carbonate of lime , and at other times more or less intermixed ...
Página 22
... chalk are the shells of the minute creatures which will be subsequently spoken of under the name of Foraminifera ( fig . 7 ) , and which , Fig . 7 - Section of Gravesend Chalk , examined by transmitted light and highly magnified ...
... chalk are the shells of the minute creatures which will be subsequently spoken of under the name of Foraminifera ( fig . 7 ) , and which , Fig . 7 - Section of Gravesend Chalk , examined by transmitted light and highly magnified ...
Página 23
... chalk and the ooze of modern oceans . Both are formed essentially in the same way , and the latter Fig . 8. - Organisms in the Atlantic Ooze , chiefly Foraminifera ( Globigerina and Textularia ) , with Polycystina and sponge- spicules ...
... chalk and the ooze of modern oceans . Both are formed essentially in the same way , and the latter Fig . 8. - Organisms in the Atlantic Ooze , chiefly Foraminifera ( Globigerina and Textularia ) , with Polycystina and sponge- spicules ...
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Términos y frases comunes
abundant allied Amongst ancient animals attain beds belong Birds Bivalves bones bony Brachiopods Britain calcareous Cambrian carbonate Carboniferous Chalk characteristic clays coal Coal-measures composed consists contain Corals Cretaceous Crinoids Crustaceans Cycads deposits Devonian Elephants Eocene Europe existing species extinct genus feet fishes Foraminifera formation forms fossils Ganoids genera genus Geol geological gigantic Glacial Graptolites Greensand horny Journ Jurassic known Lastly Laurentian less Lias lime limestones living Lower Silurian Mammals marine Mesozoic Miocene Mollusca natural North America numerous occur Old Red Sandstone Oolitic organic origin Owen Palæontographical Society Paleozoic period Permian plants plates Pliocene portion possessed Post-Pliocene present day principal Pterosaurs Quadrupeds regarded represented Reptiles resembling Rhinoceros rocks sands shales shell singular siphuncle skeleton skull Slates strata structure surface tail teeth Tertiary thickness tion tooth Trias Triassic Trilobites types Univalves Upper Miocene Upper Silurian vertebræ whilst yielded the remains
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Página 244 - Ichthyosaurus to cut through the waves. May it not therefore be concluded (since, in addition to these circumstances, its respiration must have required frequent access of air), that it swam upon or near the surface, arching back its long neck like a swan, and occasionally darting it down at the fish which happened to float within its reach.
Página 366 - Description of the skeleton of an extinct gigantic sloth, Mylodon robustus, Owen, with observations on the osteology, natural affinities, and probable habits of the megatherioid quadrupeds in general, London, 4to., 176 pp., 24 pis., 1842.
Página 363 - Eagles, owls, and gulls pursue their prey along the sea-coast; ptarmigan run in troops amongst the bushes; little snipes are busy along the brooks, and in the morasses; the social crows seek the neighbourhood of men's habitations ; and, when the sun shines in spring, one may even sometimes hear the cheerful note of the finch, and in autumn, that of the thrush...
Página 291 - ... formation occupies a middle place in the Eocene series, we are struck with the comparatively modern date to which some of the greatest revolutions in the physical geography of Europe, Asia, and northern Africa must be referred. All the mountain chains, such as the Alps, Pyrenees, Carpathians, and Himalayas, into the composition of whose central and loftiest parts the nummulitic strata enter bodily, could have had no existence till after the middle Eocene period."— Manual, p. 232. A still more...