Mesozoic • Cretaceous–Paleogene

Nisai Limestone

Paleocene

Cretaceous–Paleogene in the time scale →

Stratigraphic position

In the Chagai Hills column

IgneousShale / mudLimestoneSandstoneFossils recordedConformable

Band colour = period; texture = dominant rock type. Lines between bands mark the contact type. True scale makes height ∝ recorded thickness; hatched = thickness not recorded. Ages approximate, for ordering.

This unit (highlighted) within its province column; faded ends continue above and below. Line style marks the contact type.

A Cretaceous–Paleocene nummulitic limestone of the Axial Belt, the namesake of the Nisai Group.

Named after Nisai village near Qila Saif Ullah. Synonyms include Kharan Limestone and Robat Limestone. Contains Paleocene foraminifera.

Significance. A Cretaceous–Paleocene foraminiferal limestone succession of the Axial Belt and Balochistan basins; the namesake of the Nisai Group.

Lithology: Black nummulitic limestone with conglomerate and subordinate clastics (includes the Nimargh, Wad, Wakabi and Wakai limestones of later workers).
Thickness: 100-300 m
Type locality: Nisai, near Qila Saifullah
Environment: shallow marine, reef
Introduced by: HSC (1961); redefined Cheema et al. (1977)

Fossils

Miscellanea miscellaOther larger foraminiferaAlgae

Provinces

Chagai Hills Zhob-Muslim Bagh

References

Malkani, M.S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 24.

Reviewer confidence: medium

Related units

Below · older

Humai Formation

Cretaceous

Above · younger

Saindak Formation

Paleogene