Mesozoic • Triassic formation In GSP lexicon

Chak Jabbi Limestone

Middle Triassic (Anisian-Ladinian; ~246.7-237.0 Ma)

Kohat-Potwar Basin

Cited in 5 sources Last reviewed Jul 18, 2026

Unit summary

Rank: formation
Status: Published
Age: Mesozoic · Triassic · Middle TriassicMiddle Triassic (Anisian-Ladinian; ~246.7-237.0 Ma)
Named by: Fatmi (1972)
Type locality: Near Bagh village, Kalachitta Range (Kohat-Margala Province); reference section 1 km ESE of Bagh village
Thickness: 30 m (type section)
Lithology: Thin- to medium-bedded (15-60 cm) grey, brownish-grey-weathering sub-lithographic limestone; slope-forming; unfossiliferous.
Synonyms: Chak Jabbi Formation

A fine-grained Triassic limestone of the Kalachitta and Hazara hills, sitting between the Mianwali and Kingriali formations.

The Chak Jabbi Limestone of Fatmi (1972) is a lateral variation of the Kingriali Formation and is now regarded as a junior synonym of it. The Kingriali (originally the Kingriali dolomite, named after Kingriali peak in the Khisor Range by Gee (1945) and later amended to Kingriali Formation) consists of dolomite, limestone, dolomitic limestone, marl, sandstone and shale. Anwar et al. (1992) divided it into two members: the lower Doya (sandstone, dolomite and minor shale) and the upper Vanjari (mainly dolomite). Some brachiopods, bivalves and crinoidal remains are reported. Age Late Triassic.

Fossils

Not recorded

Contacts

In the Kohat Basin column

SandstoneLimestoneFossils recordedContact not recorded

Band colour = period; texture = dominant rock type. Lines between bands mark the contact type; dotted = no contact recorded in the sources (not a claim of conformity). 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.

Distribution & setting

Kohat Basin

Basin: Kohat-Potwar Basin
Region: Not recorded
Depositional environment: marine
Coordinates: Not recorded

Correlation

Not recorded. Compare this unit against other basins on the correlation panel →

Economic significance

Cement & lime

Raw material for cement; mined in the lowest beds exposed east of the Hattar Cement Factory.

Remarks

A Triassic shallow-marine sublithographic limestone of the Upper Indus Basin, conformably overlying the Mianwali Formation and grading up into the Kingriali Formation; it occupies a stratigraphic position equivalent to the Tredian Formation and is largely unfossiliferous.

Research notes (4)

Field-by-field findings drawn from the cited literature. Every statement is traced to a registered source — follow a citation for the full reference.

Name & nomenclature (1)

Attested in Shah (2009), Geological Survey of Pakistan Memoir 22 - the Stratigraphic Committee of Pakistan's compiled lexicon (listed in the memoir's contents). Adds the definitional GSP/SCP lexicon citation.

Shah, S.M.I. (2009)

Age & correlation (1)

Middle Triassic (Anisian-Ladinian) assigned on stratigraphic position between the Mianwali and Kingriali formations; correlative with the Tredian Formation of the Salt Range.

Indian Plate Lexicon (indplex.geolex.org), Geological Society of India and international compilation.

Lithology (1)

Lithology revised to Fatmi's sub-lithographic, unfossiliferous limestone; the prior dolomitic description appears to have been conflated with another unit.

Indian Plate Lexicon (indplex.geolex.org), Geological Society of India and international compilation.

Type locality & location (1)

Type locality corrected from 'Kingriali peak in Khisor' to the Kalachitta Range (near Bagh village, Kohat-Margala Province) per Fatmi (1972) / Indian Plate Lexicon; the Khisor Range attribution was in error.

Indian Plate Lexicon (indplex.geolex.org), Geological Society of India and international compilation.

Sources (4)

Malkani, M.S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 24.
Kazmi, A.H. & Jan, M.Q. (1997). Geology and Tectonics of Pakistan. Graphic Publishers, Karachi.
Indian Plate Lexicon (indplex.geolex.org), Geological Society of India and international compilation.
Shah, S.M.I. (2009). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 22.

Reviewer confidence: high

Every fact on this page is source-cited. This entry is part of the peer-archived Pakistan Stratigraphy Dataset (doi.org/10.5281/zenodo.21363991, CC‑BY‑4.0).

Lexicon status: Name attested in the Shah (1977/2009) Geological Survey of Pakistan compilation — the national stratigraphic lexicon. This records where the name is documented; it is not an endorsement of the unit’s definition, age or figures.

Spotted an error? Suggest a sourced correction →

Cite this unit

APA

Qudsi, L. (2026). Chak Jabbi Limestone. In Pakistan Stratigraphy Dataset [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21363991

BibTeX

@misc{stratigraphypk_chakjabbilimestone,
  author    = {Qudsi, Lareb},
  title     = {{Chak Jabbi Limestone} --- Pakistan Stratigraphy Dataset},
  year      = {2026},
  publisher = {Zenodo},
  doi       = {10.5281/zenodo.21363991},
  url       = {https://doi.org/10.5281/zenodo.21363991}
}

Archived dataset: doi.org/10.5281/zenodo.21363991 (CC‑BY‑4.0) · Direct link to this entry: https://stratigraphy.pk/formation/chak-jabbi-limestone (accessed October 29, 2026).

To cite the unit's original definition instead, see: Fatmi (1972).

Below · older

Mianwali Formation

Triassic

Above · younger

Kingriali Formation