Paleoenvironmental and biostratigraphic significance of uvigerinids and other foraminifera from the Bhuban Formation,Assam-Arakan Basin,Mizoram |
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Authors: | Kapesa Lokho D S N Raju R J Azmi |
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Institution: | (1) Wadia Institute of Himalayan Geology, Dehradun, 248001, Uttarakhand, India |
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Abstract: | Planktic and benthic foraminifera including uvigerinids are documented from the Upper Bhuban Formation, exposed at Thingdawl
village, Kolasib district, Mizoram. The foraminiferal assemblage is poorly preserved and consists of index fossils useful
for precise biochronology and interpretation of the depositional environment. A total of ten benthic and six planktic foraminiferal
species are described. Six species belong to the genus Uvigerina, four to Ammonia, one species each of Globorotalia, Globigerinoides, Clavatorella, Praeorbulina and two species of the genus Orbulina. Based on lithological and foraminiferal assemblage, middle neritic to upper part of outer neritic paleobathymetry is inferred
for the deposition of this part of the Upper Bhuban Formation. The foraminiferal assemblage suggests late Early Miocene to
early Middle Miocene, (∼16 Ma) equivalent to planktic foraminiferal zones N8-N9 for the Upper Bhuban Formation. |
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