Every field geologist who is more than a rock hound makes use of stratigraphy. As paleontology is one of the most useful adjuncts to stratigraphy, it behooves every geologist who works with fossil-bearing strata to make such use as circumstances permit of the organisms entombed in the rocks. The helpfulness of paleontology to stratigraphers is so obvious that it needs no brief from me. I therefore pass on to a short discussion of the relative merits of the various kinds of fossils as aids in determining the correlation of formations.
In general, the more highly developed the organism, the shorter...
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