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- W210448503 abstract "Based on Aurora, North Carolina, radiometric ages and fossil assemblages, current literature equates the Chowan River and Bear Bluff formations. Age and correlation of the Pliocene Chowan River and Bear Bluff formations, assigning an age of approximately 2.5 ma. However, molluscan assemblages from the Chowan River stratotype and Virginian equivalents represent an older stage of molluscan assemblage evolution not contemperaneous with the 2.5 ma beds at Aurora. Rather, the Chowan River molluscan fauna is intermediate between that of the upper Yorktown (3.2 ma) and that of the older Waccamaw (2.5 ma). The Oxygen isotope model of Krantz (1991) postulates related transgressions at 2.7 and 2.9 ma, which coincide with the two members at the stratotype area and with the two-fold division of the unit in Virginia. In southern North Carolina, Chowan River-equivalent beds at Tar Heel and Elizabethtown have been assigned to the Bear Bluff Formation, a composite of non-contiguous beds ranging from 2.5 to 3.7 ma. No equivalents are known between Elizabethtown and southern Florida where beds 2 and 3 at the APAC pit in Sarasota appear correlative. Faunal assemblages of these beds remain imperfectly documented, but their intermediate character, younger than typical Pinecrest but older than typical Caloosahatchee,more » is evident from preliminary reports. The intermediate nature of the fauna containing index species once thought to be mutually exclusive, will necessitate a thorough revision of Pliocene index species zonation when the faunas become better known.« less" @default.
- W210448503 created "2016-06-24" @default.
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- W210448503 date "1993-03-01" @default.
- W210448503 modified "2023-09-28" @default.
- W210448503 title "Age and correlation of the Pliocene Chowan River Formation of Virginia and northeastern North Carolina" @default.
- W210448503 hasPublicationYear "1993" @default.
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