Such a free percolation may prevented either the mineral nature the matrix itself, or the superposition an impermeable stratum but if unimpeded, the fossil shell or bone will dissolved and removed, particle after particle, and thus entirely effaced, unless petrifaction or the substitution some mineral for the organic matter happen take place. That there has been land as well as sea at all former geological periods, know from the fact that fossil trees and terrestrial plants are imbedded in rocks every age, except those which are ancient as very imperfectly known Occasionally lacustrine and fluviatile shells, or the bones amphibious or land reptiles, point the same conclusion.
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The existence dry land at all periods the past implies, as before mentioned, the partial deposition sediment, or its limitation certain areas and the next point which I shall call the reader's attention the shifting these areas First, then, variations in the site sedimentary deposition best essay writing service online are brought about independently write my book report subterranean movements. There always a slight change from year year, or from century century.
The sediment the Rhone, for example, thrown into the Lake Geneva, now conveyed a spot a mile and a half distant from that vhere accumulated in the tenth century, and six miles from the point where the delta began originally mla paraphrasing citation form. We may look forward the period when this lake will filled and then the distribution the transported matter will suddenly altered, for the mud and sand brought down from the Alps will thenceforth, instead being deposited near Geneva, carried nearly miles southwards, where the Rhone enters the Mediterranean. In the deltas large rivers, such as those the Ganges and Indus, the mud first carried for many centuries through one arm, and this being stopped discharged another, and may then enter the sea at a point miles distant from its first receptacle. The direction marine currents also liable changed various accidents, as the heaping new sand banks, or the wearing away cliffs and promontories.
But, secondly, all these causes fluctuation in the sedimentary areas are entirely subordinate those great upward or downward movements land, vhich will presently spoken as prevailing over large tracts the globe. By such elevation or subsidence certain spaces are gradually submerged, or made gradually emerge in the one case sedimentary deposition may suddenly renewed after having been suspended for one or more geological periods, in the other as suddenly made cease after having continued for ages. If deposition renewed after a long interval, the new strata will usually differ greatly from the sedimentary rocks previously formed in the same place, and especially if the older rocks have suffered derangement, which implies a change in the physical geography the district since the previous conveyance sediment the same spot.
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It may happen, however, that, even where the two groups, the superior and the inferior, are horizontal and conformable each other, they may still differ entirely in mineral character, because, since the origin the older formation, the geography some distant country has been altered.
In that country rocks before concealed may have become exposed denudation volcanos may have burst out and covered the surface with scoriæ and lava or new lakes, intercepting the sediment previously conveyed from the upper country, may have been formed subsidence and other fluctuations may have occurred, which the materials brought down from thence rivers the sea have acquired a distinct mineral It well known that the stream the Mississippi charged with sediment a different colour from that the Arkansas and Red Rivers, which are tinged with red mud, derived from rocks porphyry and red gypseous clays in the far west. The waters the Uruguay, says Darwin, draining a granitic country, are clear and black, those the Parana, red. The mud with which the Indus loaded, says Burnes, a clayey hue, that the Chenab, the other hand, reddish, that the Sutlej more pale. The same causes which make these several rivers, sometimes situated at no great distance the one from the other, differ greatly in the character their sediment, i need help writing a thesis will make the waters draining the same country at different epochs, especially before and after great revolutions in physical geography, entirely dissimilar. It scarcely necessary add that marine currents will affected in an analogous manner in consequence the formation nevI shoals, the emergence new islands, the subsidence others, the gradual waste neighbouring coasts, the growth new deltas, the increase coral reefs, volcanic eruptions, and other changes.
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Unifortrlity change considered, secondly, in reference the living creation. Secondly, in regard the vicissitudes the living creation, all are agreed that the successive groups sedimentary strata found in the earth's crust are not only dissimilar in mineral composition for reasons above alluded but are likewise distin.
guishable from each other their organic remains. The general inference drawn from the study and comparison the various groups, arranged in chronological order, this that at successive periods distinct tribes animals and plants have inhabited the land and waters, and that the organic types the newer formations are more analogous species now existing than those more ancient rocks. If then turn the present state the animate creation, and enquire whether has now become fixed and stationary, discover that, the contrary, in a state continual flux-that there are many causes in action which tend buy essays online for college the extinction species, and which are conclusive against the doctrine their unlimited durability. There are also causes which give rise new varieties and races in plants and animals, and new forms are continually supplanting others which had endured for ages. But natural history has been successfully cultivated for short a period, that a fevl examples only local, and perhaps but one or two absolute, extirpation species can as yet proved, and these only where the interference man has been conspicuous. It will nevertheless appear evident, from the facts and arguments detailed in the chapters which treat the geographical distribution species in the nex man not the only exterminating agent and that, independently his intervention, the annihilation species promoted the multiplication and gradual diffusion every animal or plant.
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