Manual of Geology Treating of the Principles of the Science With Special Refere
Manual of Geology Treating of the Principles of the Science With Special Refere
James Dwight Dana
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Hence, as H. S. Williams has said, " the actual order of faunas met with in a vertical section is not necessarily expressive of biological sequence, but only of the sequence of the occupants of that particular area. " Such recurrences of species are likely to be met with in all regions where fine shales, coarse shales, argillaceous sandstones, quartzose sandstones, with or without limestones of varying purity, are in alternation. 3. The difference in the time at which species or groups have beg...un to exist in different regions. The several continents may not have been exactly parallel, in all the steps of progress in the life of the globe. Certain families may have commenced a little earlier in one than in another ; or again, one conti- nental sea or region, over a continent, may have received some of its species by migration from another, long after their first appearance. Here is a source of doubt : what may be due, on one side, to special continental idiosyn- crasies in condition or history, and, on the other, to migrational distribu- tion, is always to be carefully considered.
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