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But we can argue that "in the past era the same or closereach other organic forms had a broader distribution area,than at present". Perhaps it was so; but the arguments given in theconfirmation of this does not prove it. The argument on whichthe basis for this conclusion, this has the disadvantage that it is very easyto give an example of evidence about a circle. Fossils, as alreadynoted above, are the only data, on the basis of whichto ensure relevance far removed from one another of the formations.So, if a simultaneity of distant formations we conclude by similaritytheir fossils, how can we argue that similaranimals and plants were once more widely spread thannow, just on the basis that they meet the simultaneouslayers lying at a far distance from each other? Not obvious whetherthe falsity of such reasoning? But even if it did not arisesuch fatal objection, yet the proof given inconfirmation of this opinion, is unsatisfactory. We don't haveforget that the community of organic remains commonly taken forsufficient proof of relevance in time, in fact, isvery incomplete community. When compare between sedimentary layersfar away from one another, it is impossible to expect that there be many kinds,common to both of them; it is sufficient if it appears a significant number of commonchildbirth. If it could be proved that during the geological past eachthe family lived only in the continuation of the short time - spanmeasured one particular group of strata, - could still be anythingto conclude from such community of birth. But it is quite another matter when we find outmany genera continued to exist during the vast epochs measuredseveral extensive systems of reservoirs "Between birth shellfish knowncalled zhemchuzhnikova (Avicula), pa-koskovich (Modiola), POWERLINK(Terebratula), spatulas (Lingula), circles (Orbicula) are startingfrom the Silurian rocks up to the present time." So, if betweenthe most ancient formations containing fossils, and the newest there isthis degree of commonality, it is not whether we have a right to conclude that, for allprobability, there must be great similarity between such layersdoes not belong to the same era?
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