Abstract
No comprehensive study of our Carboniferous ammonoids has been attempted since the very beginning of the present century. Only three ammonoid zones can now be recognized in the American Mississippian system. These seem to be more or less equivalent to our Kinderhook, Osage, and Meramec-Chester beds, and they are characterized by the genera Protocanites, Beyrichoceras, and Goniatites, respectively. Locally, ammonoids are abundant in the Kinderhook and the Meramec, but elsewhere they are rare. Our Devonian and Mississippian systems are not known to carry a single ammonoid genus in common, and only two stocks cross the border between them. One of these, the prolecanitids, became quite varied in the Mississippian, and they have a considerable amount of stratigraphic value there. The other stock that continues into the Mississippian is represented by the genus Imitoceras. Its descendants underwent a great development during the Carboniferous and gave rise to most of the many diverse forms known from there. Alt...
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