Source provenance

Khan, M.H. (1968). The dating and correlation of the Nari and the Gaj Formations. Geological Bulletin of the Punjab University, 7, 57-65.

Cited by 3 units (3 published) · 0 field-level citations · 3 revision notes.

Larger-foraminiferal biozonation of the Upper Nari and Gaj formations near Karachi (Karachi Test Well No. 1, Pir Mangho). Two zones: a Spiroclypeus blanckenhorni ornata Zone (Aquitanian; Spiroclypeus spp., Eulepidina dilatata/formosa, Nephrolepidina, early Miogypsinoides) spanning the upper Upper Nari to basal Gaj, and an overlying Miogypsina globulina Zone (Late Aquitanian–Burdigalian) in the Gaj. Ages: Upper Nari = Rupelian–Early Aquitanian; Gaj = Late Aquitanian–Burdigalian. Also revises the Khirthar Formation as Lutetian–Rupelian (with a late-Auversian–Bartonian hiatus).

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Units citing this source

• Cenozoic Gaj Formation Neogene
  • Age: Biozonation near Karachi (Khan, 1968): the Gaj Formation is Late Aquitanian to Burdigalian, carrying the Miogypsina globulina Zone — Miogypsina globulina/intermedia/tani/gunteri/cushmani, Miogypsinoides dehaarti, Austrotrillina howchini and Taberina malabarica — with lepidocyclinids disappearing in its upper half.
• Cenozoic Kirthar Formation Paleogene
  • Age: Khan (1968) places the Khirthar (Kirthar) Formation as Lutetian to Rupelian, with a regional hiatus spanning the late Auversian and Bartonian; the upper Khirthar Limestone (Gorag Member) yields a Lattorfian assemblage (Nummulites intermedius/fichteli, Austrotrillina paucialveolata, devoid of Eulepidina).
• Cenozoic Nari Formation Paleogene
  • Age: Larger-foraminiferal biozonation near Karachi (Khan, 1968): the Upper Nari Formation ranges Rupelian to Early Aquitanian; its upper part carries fossiliferous marine limestone bands of the Spiroclypeus blanckenhorni ornata Zone (Aquitanian) — Spiroclypeus blanckenhorni ornata, S. ranjae, S. margaritatus, Eulepidina dilatata/formosa, Nephrolepidina cf. angulosa and early Miogypsinoides — whereas the arenaceous fluvio-deltaic facies of northern Sind is Chattian.