Class-book of GeologyMacmillan and Company, 1886 - 516 páginas |
Dentro del libro
Página vi
... chiefly from my own note - books . I have to thank Messrs . J. D. Cooper and M. Lacour for the skill with which they have given in wood - engraving the expres- sion of the originals . CONTENTS . CHAPTER I. PAGE INTRODUCTORY I PART I ...
... chiefly from my own note - books . I have to thank Messrs . J. D. Cooper and M. Lacour for the skill with which they have given in wood - engraving the expres- sion of the originals . CONTENTS . CHAPTER I. PAGE INTRODUCTORY I PART I ...
Página 22
... chiefly on flat or gently inclined ground . Where the slope is steep , the decomposed layer will tend to travel down - hill by mere gravitation , and to be further im- pelled downward by descending rain - water . If there is so intimate ...
... chiefly on flat or gently inclined ground . Where the slope is steep , the decomposed layer will tend to travel down - hill by mere gravitation , and to be further im- pelled downward by descending rain - water . If there is so intimate ...
Página 46
... chiefly by the angle of slope ; the greater the declivity , the higher the velocity and the larger the capacity of the stream to carry down debris . Any cause , therefore , which lessens the velocity of a current diminishes its carrying ...
... chiefly by the angle of slope ; the greater the declivity , the higher the velocity and the larger the capacity of the stream to carry down debris . Any cause , therefore , which lessens the velocity of a current diminishes its carrying ...
Página 62
... chiefly formed , it sometimes yields the bones of deer , oxen , and other animals , whose carcases must originally have sunk to the bottom of the lake and been there gradually covered up in the growing mass of marl . Many examples of ...
... chiefly formed , it sometimes yields the bones of deer , oxen , and other animals , whose carcases must originally have sunk to the bottom of the lake and been there gradually covered up in the growing mass of marl . Many examples of ...
Página 100
... chiefly because they are demolished by the sea , they ought to be most eroded at the bottom , and should therefore be usually overhanging precipices . That this is not the case shows that some other agency is concerned which causes the ...
... chiefly because they are demolished by the sea , they ought to be most eroded at the bottom , and should therefore be usually overhanging precipices . That this is not the case shows that some other agency is concerned which causes the ...
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Términos y frases comunes
abundant accumulated acid augite basin beds bones bottom Brachiopods calcareous calcite carbonate of lime Carboniferous chapter characteristic chiefly clay containing corals Cretaceous crinoids crystalline crystals cycads decay deposits detritus Devonian earth earth's crust Eocene Europe evidence example extinct fauna feet thick fishes fissures fossils genera geological history geologist glacier globe gradually granite gravel ground gypsum iron Jurassic kinds known lakes land lava layers limestone living lower marine marls masses materials Mesozoic miles mineral matter Miocene molten mountains natural North occur Old Red Sandstone organic remains original Palæozoic period Permian plants and animals Pliocene present preserved probably quartz rain records regions rivers salt sand schists sea-floor Section sediment sedimentary rocks shales sheets shells siliceous Silurian slopes soil solid sometimes species stone strata stratified stream structure substance surface terrestrial Tertiary tion trace Triassic upper valley various vegetation vent volcanic