Planktonic Foraminiferal Biostratigraphy of the Early Tertiary of the Rakhi Nala Section Sulaiman Range, West Pakistan

Authors

  • Bimal K. Samanta
     Department of Geology, University of Calcutta, Calcutta

Abstract

Of the four Formations, the Ranikot, the Dunghan, the Ghazij and the Khirthar, constituting the early Tertiary succession exposed in the Rakhi Nala, a river in the Sulaiman Range, West Pakistan, only the upper Dunghan Formation, the lower part of the Ghazij Formation and the upper Khirthar Formation have yielded good planktonic foraminifera. A total of seventy-nine species and subspecies of planktonic foraminifera, including two new species, are identified, The range of stratigraphically significant species perinits recognition of eight planktonic foraminiferal zones in the sequence. Between the fifth and sixth faunal zones there is an interval with reworked Upper Cretaceous planktonic foraminifera in the lower part and rare, indeterminable planktonic foraminifera in the upper. The Rakhi Nala zones are compared and correlated with those established by Bolli in Trinidad. On the basis of the planktonic foraminiferal content, the upper Dunghan Formation is dated as Middle Palaeocene to lower Lower Eocene, the lower part of the Ghazij Formation as middle Lower Eocene and the upper Khirthar Formation as middle Middle Eocene to Upper Eocene in age.

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Issue

Volume 13, Issue 4, December 1972

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Articles

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Published

1972-12-01

How to Cite

Samanta, B. K. (1972). Planktonic Foraminiferal Biostratigraphy of the Early Tertiary of the Rakhi Nala Section Sulaiman Range, West Pakistan. Journal of Geological Society of India, 13(4), 317–328. Retrieved from https://geosocindia.com/index.php/jgsi/article/view/61787

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