The Paleogene and Neogene boundary of Pakistan
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A.A. Kureshy [1]
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[1] Staten Island, New York
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- Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 14, Nº. 1-3, 1982, págs. 221-229
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
The Paleogene and Neogene strata of Pakistan represents both marine and non marine deposition and quite distinct in its lithologies. The Baluchistan and the Lower Indus basins of Pakistan are characterized by the marine deposition of Paleogene and Neogene boundary, but in the Upper Indus basin the boundary is marked between the marine and non marine with a great hiatus. The marine deposits of Paleogene (Oligocene) and Neogene (Miocene) are characterized by the foraminiferal assemblages. In the Baluchistan basin the Oligocene-Miocene deposits are designated to Khojak Fm. The planktic foraminifera of Upper Oligocene is marked by the extinction of Globigerina angustisuturalis and G. selli, and first appearence of Globoquadrina dehiscens and Globigerinoides triloba marked in the Lower Miocene. The Paleogene/Neogene boundary of the Lower Indus basin is marked between the Nari and Gaj formations on the basis of the larger foraminifera. The Nari Fm. (Oligocene) is characterized by Lepidocyclina dilatata and Spiroclypeus margaritatus and Gaj Fm. of Lower Miocene is characterized by Miogypsina gunteri and Lepidocyclina marginata. In the Upper Indus basin the Oligoce deposits are missing, the Kohat limestone of Eocene age overlies by the Murree Fm. of Miocene age.
