Kansas Geological Survey, Current Research in Earth Sciences, Bulletin 258, part 4
Prev Page--Assemblages
Kansas Geological Survey, Current Research in Earth Sciences, Bulletin 258, part 4
Prev Page--Assemblages
At the present state of knowledge, the change of fusulinid faunas across the recently designated conodont-based Carboniferous (Pennsylvanian)-Permian boundary in midcontinent North America is transitional in character. The appearance of the conodont Streptognathodus isolatus in the basal Bennett Shale Member of Kansas marks the new systemic boundary at a maximum flooding surface, but the fusulinid assemblages below and directly above the new conodont-based boundary are essentially the same. The first definitive early Permian (Wolfcampian Series) fusulinid (Paraschwagerina kansasensis) does not appear until the Neva Limestone Member of the Grenola Limestone, which is the regressive highstand limestone of the second 4th order depositional sequence above the new systemic boundary. In slightly higher Cottonwood and Morrill Limestone Members of the Beattie Limestone, additional typical early Wolfcampian fusulinids appear (i.e., Schwagerina jewetti, S. vervillei). The gradual nature of the fusulinid assemblage turnover across the systemic boundary relative to that of the pelagic conodonts is probably related to the shallow-water benthic habitat of the fusulinids. Whereas the pelagic conodont assemblages appear to change relatively rapidly during the maximum flooding, changes in the benthic fusulinid assemblages might have been tied more closely to regional paleoenvironmental factors, such as the midcontinent paleoclimatic transition from humid to more arid conditions. The composition of fusulinid assemblages across the Carboniferous (Pennsylvanian)-Permian boundary changed gradually through several 4th order depositional sequences.
We would like to thank Robert Sawin, Charles Ross, Calvin Stevens, and Merlynd Nestell for their manuscript reviews and their insightful comments and suggestions.
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Kansas Geological Survey
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