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Pleistocene heteropods and pteropods in limestones dredged along the east yucatan scarp caribbean sea



Pleistocene heteropods and pteropods in limestones dredged along the east yucatan scarp caribbean sea



Bollettino della Societa Paleontologica Italiana 17(1): 118-141



A shell-bearing pteropod and heteropod rich fauna representing the bulk of Pleistocene biocalcarenites dredged along the East Yucatan Scarp (Caribbean Sea) at a depth of 500-700 m was studied. Two species of heteropods, 12 spp. and 1 ssp. of pteropods were identified along with Atlanta peronii, Clio cuspidata, Diacria quadridentata orbignyi, Cavolinia longirostris f. strangulata and Cuvierina columnella for the 1st time as fossils of the Pleistocene age from the Caribbean area. The bulk of the association consists of Limacina inflata and Styliola subula; Diacria quadridentata orbignyi, Limacina bulimoides and Limacina trochiformis are also abundant. All species still live in the Atlantic Ocean. The pteropod sediments fall into the Globigerina calida calida subzone of Globorotalia truncatulinoides zone (Upper Pleistocene) and are as old as 100,000 yr. Paleoenvironmental and paleoclimatic considerations show that: the pteropod fauna appear to be indigenous; the whole fauna studied appears to be from warm water because of Limacina bulimoides, Creseis acicula, Styliola subula, Cuvierina columnella and the absence of cold species such as L. retroversa and L. helicina; the associated planktonic foraminifera are from temperate to warm water. A correlation with a temperate-warm interval of an X zone (warm stage) of the standard curve of Ericson et Wollin (1968) and with stage 5 of the generalized curve of Emiliani (1966, 1971a) is likely. In the present 100,000 yr old fauna, the abundance of pteropods seems to correspond to a temperate-warm climate.

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Accession: 006135660

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