Excerpt from On the Classification of the Early Cambrian and Pre-Cambrian Formations
The general principles of homotaxis and of the use of fossils in classifying formations are not here under discussion. It is proposed rather, supposing a region with the general conditions above stated, to consider how such fossils as are found may be used in marking off from one another the grander groups of strata, how far they may be used in recognizing these groups at other points in the same geo logical basin, and how far they may be used in correlating these groups with those of the general geological column.
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