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The crust of the earth is a vast museum; but the natural collections have been made only at intervals of time immensely remote.

These must be cleared out of the way because they have been the subject of serious misunderstandings.These contingencies will concur only rarely, and after enormously long intervals.Whilst the bed of the sea is stationary or is rising, or when very little sediment is being deposited, there will be blanks in our geological history.[Patton introduces an ellipsis, apparently solely to mark the beginning of a new paragraph.] If the carbon dioxide dissolved in sea water decreases, some bicarbonate ions change to carbonate, thereby causing precipitation of calcium carbonate. Most are biogenic, and consist primarily of microscopic or macroscopic shells (or at least these make up a considerable fraction, and often almost all, of the rock volume).The precipitate forms a fine, crystalline cloud which settles to the bottom. This is true of limestone production today too, most of which is in association with biological activity.

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I endeavoured, also, to show that intermediate varieties, from existing in lesser numbers than the forms which they connect, will generally be beaten out and exterminated during the course of further modification and improvement.

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