The Ancient Life-history of the Earth: A Comprehensive Outline of the Principles and Leading Facts of Palæontological ScienceD. Appleton & Company, 1878 - 407 páginas |
Dentro del libro
Resultados 1-5 de 80
Página 5
... true ele- ment of the case . An earthquake may remove a mountain in the course of a few seconds ; but the dropping of the gentle rain will do the same , if we extend its operations over a millen- nium . And this is true of all agencies ...
... true ele- ment of the case . An earthquake may remove a mountain in the course of a few seconds ; but the dropping of the gentle rain will do the same , if we extend its operations over a millen- nium . And this is true of all agencies ...
Página 6
... true one . In the first place , we may postulate that the world had a beginning , and , equally , that the existing terrestrial order had a beginning . However far back we may go , geology does not , and cannot , reach the actual ...
... true one . In the first place , we may postulate that the world had a beginning , and , equally , that the existing terrestrial order had a beginning . However far back we may go , geology does not , and cannot , reach the actual ...
Página 8
... . The fundamental prin- ciple of catastrophism is , therefore , not wholly vicious ; and we have reason to think that there must have been periods- very remote , it is true , and perhaps unrecorded 8 PRINCIPLES OF PALEONTOLOGY .
... . The fundamental prin- ciple of catastrophism is , therefore , not wholly vicious ; and we have reason to think that there must have been periods- very remote , it is true , and perhaps unrecorded 8 PRINCIPLES OF PALEONTOLOGY .
Página 9
... true , and perhaps unrecorded in the history of the earth - in which the known physical forces may have acted with an intensity much greater than direct observation would lead us to imagine . And this may be believed , alto- gether ...
... true , and perhaps unrecorded in the history of the earth - in which the known physical forces may have acted with an intensity much greater than direct observation would lead us to imagine . And this may be believed , alto- gether ...
Página 12
... true origin of the former . In It only remains to add that there is sometimes a further complication . If the rock be very porous and permeable by water , it may happen that the original shell is. 00 Fig . 1. - Trigonia longa , showing ...
... true origin of the former . In It only remains to add that there is sometimes a further complication . If the rock be very porous and permeable by water , it may happen that the original shell is. 00 Fig . 1. - Trigonia longa , showing ...
Otras ediciones - Ver todas
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
Pasajes populares
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...