. Bulletin. Natural history. 34 PEABODY MUSEUM BULLETIN 34 BIVALVE-STRATI GRAPHIC RELATIONSHIPS. 0) ^ y Tonerediopsis cuneata ^ N^ Ischyrodonta truncati. ^ / Ambonychia proecursa Q N^ Modiolopsis modiolaris m FEW BI VALVES — BRACHIOPOD DOMINATED (See fig. 15) Ly rodesma poststri at urn Praenucula levata Ctenodonta'? pulchella FIG. 18. A composite columnar section from the upper and middle( ?) Reedsville in south-central Pennsylvania showing a pronounced stratigraphic-faunal separation of bivalve provinces I and IL See Figure 1 7 for geographic extent of this overlap. bedding plane, in contrast
. Bulletin. Natural history. 34 PEABODY MUSEUM BULLETIN 34 BIVALVE-STRATI GRAPHIC RELATIONSHIPS. 0) ^ y Tonerediopsis cuneata ^ N^ Ischyrodonta truncati. ^ / Ambonychia proecursa Q N^ Modiolopsis modiolaris m FEW BI VALVES — BRACHIOPOD DOMINATED (See fig. 15) Ly rodesma poststri at urn Praenucula levata Ctenodonta'? pulchella FIG. 18. A composite columnar section from the upper and middle( ?) Reedsville in south-central Pennsylvania showing a pronounced stratigraphic-faunal separation of bivalve provinces I and IL See Figure 1 7 for geographic extent of this overlap. bedding plane, in contrast to the much stronger association between Ambonychia praecursa and Modiolopsis modiolaris. There is a slight mixing of faunas of provinces II and III in southwestern Virginia, where there is no stratigraphic separation like that between I and II in the north. Bivalve province III is as restricted geographically as province I and shows no greater diversity, but the specimens are more numerous in a series of closely spaced localities. The two dominant species in province III, Pterinea [Caritodens) demissa and Ambonychia cultrata, exhibit no consistent stratigraphic Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Peabody Museum of Natural History. New Haven, Peabody Museum of Natural History, Yale University
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