DISTRIBUTION OF JURASSIC BIVALVE FAUNAS IN RELATION TO PALAEOGEOGRAPHY AND PALAEOCLIMATE

Faunal distribution is generally thought to be a result of the interaction of various related biological and environmental factors. However, for different geological time intervals and for different organisms, decisive factors governing biogeographical patterns may be different. The bivalve data obtained from the Jurassic Proto Atlantic indicate that latitudinal temperature gradients and palaeogeographical factors have greatly contributed to the distribution of bivalve faunas. A number of Jurassic characteristic bivalves from the Proto Atlantic show a clear latitudinal control. The northward dispersal of several bivalve taxa of Tethyan affinity during the Early and Middle Jurassic might have been a result of climatic amelioration. The physical barriers hindered faunal exchange and seaways promoted faunal spread. All these factors are influenced by other environmental conditions.e; Gassmann equation; elastic modulus

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Q915.817.4 Q914.5