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But asanimals and plants living on land, have much lesslikely to withstand the accidents associated with resettlementdistant shores, rather than marine organisms, it is clear that much more timeafter the sea surrounding these new lands will become richflora and fauna, the land itself will remain relatively still empty; herewhy do more ancient strata, like our Silurian will not beto present no traces of life on land. Aftervast areas of Land were put on the surface of the ocean, you mayexpect a rich flora has developed on this continent. Under whatconditions can we hope to find fossil traces of this vegetation?Large tracts of Land are forced to assume large rivers andinseparable from the last Delta and, in addition, are usually swamps andlake. All this, as we know from experience, is very conducive to luxuryvegetation and gives her the ability to survive in acoal layers. So, it should be noted that in the ancient erathe history of this continent could not happen Carboniferous period; hebecame possible only after long-lasting increasesoil pushed out of the water large areas of land. Just as inseveral of the sedimentary layers, coal layers will only appear afterhuge savings of more ancient strata filled with fossilsremains of marine organisms. Let us now see in what order they should appear in the highest formanimal life. We have seen in a sequence of marine organismsspoke a sort of gradual progression from lower to higher and howwe thus came at last to prey on molluscs, crustaceans and fish.
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