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 x
... Upper Laurentian - Reasons for believing that the Lauren- tian rocks are not ... Upper Cambrian - Cambrian de- posits of the continent of Europe and North America - Life of the Cambrian period ... Silurian period - The Silurian X CONTENTS .
... Upper Laurentian - Reasons for believing that the Lauren- tian rocks are not ... Upper Cambrian - Cambrian de- posits of the continent of Europe and North America - Life of the Cambrian period ... Silurian period - The Silurian X CONTENTS .
Página xi
... Silurian period - The Silurian rocks generally - Limits of Lower and Upper Silurian - General succession , subdivisions , and characters of the Lower Silurian rocks of Wales - General succes- sion , subdivisions , and characters of the ...
... Silurian period - The Silurian rocks generally - Limits of Lower and Upper Silurian - General succession , subdivisions , and characters of the Lower Silurian rocks of Wales - General succes- sion , subdivisions , and characters of the ...
Página xvi
... Silurian Crustaceans , 104 104 105 139 . 141 141 78. Prototaxites Logani , 79. Stromatopora tuberculata , 140 80 ... Upper Silurian rocks , 95. Spirifera sculptilis , • 147 117 96. Spirifera mucronata , 147 58. Monograptus priodon , 119 ...
... Silurian Crustaceans , 104 104 105 139 . 141 141 78. Prototaxites Logani , 79. Stromatopora tuberculata , 140 80 ... Upper Silurian rocks , 95. Spirifera sculptilis , • 147 117 96. Spirifera mucronata , 147 58. Monograptus priodon , 119 ...
Página 30
... ( Upper Greensand ) and Tertiary deposits . Phosphate of lime forms the larger proportion of the earthy matters of the ... Silurian series , this salt may also occur disseminated through the rock , when it can only be detected by chemical ...
... ( Upper Greensand ) and Tertiary deposits . Phosphate of lime forms the larger proportion of the earthy matters of the ... Silurian series , this salt may also occur disseminated through the rock , when it can only be detected by chemical ...
Página 39
... Upper Silurian period . We should not forget , therefore , in determining the age of strata by palæonto- logical evidence , that we are always reasoning upon generalisa- tions which are the result of experience alone , and which are ...
... Upper Silurian period . We should not forget , therefore , in determining the age of strata by palæonto- logical evidence , that we are always reasoning upon generalisa- tions which are the result of experience alone , and which are ...
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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...