The systematics of two hundred and eighty-nine prosobranch gastropods from the early to middle Pleistocene Moin Formation of Costa Rica are treated. The paleoecology of most extant and some extinct species of these mollsucs is discussed, and a paleoecological reconstruction of the Punta Limon peninsula is made. The presence of recognizable communities on differing substrates within the ecological zonation of a fringing reef is shown, from the intertidal zone down to the inner shelf at the base of the reef system itself, where ultimate deposition of the Moin Formation occurred. The faunal composition of the Moin indicates the occurrence of species-rich faunas evolving during the Pleistocene interglacial times, each involving speciation events following the extinction events of intervening glacial pulses. Evidence is given for the presence of a western Caribbean subprovincial unit during the Pleistocene, which continues on to the present day / acase@tulane.edu
| Identifer | oai:union.ndltd.org:TULANE/oai:http://digitallibrary.tulane.edu/:tulane_23172 |
| Date | January 1991 |
| Contributors | Robinson, David Gwyn (Author), Vokes, Emily Hoskins (Thesis advisor) |
| Publisher | Tulane University |
| Source Sets | Tulane University |
| Language | English |
| Detected Language | English |
| Rights | Access requires a license to the Dissertations and Theses (ProQuest) database., Copyright is in accordance with U.S. Copyright law |
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