Paleozoic • Silurian–Devonian formation GSP memoir

Tursak Formation

Silurian–Devonian

Northern Indus Suture

Part of Bampokha Group

Silurian–Devonian in the time scale →

Cited in 1 source Last reviewed Jul 15, 2026

Unit summary

Rank: formation
Status: Published
Age: Paleozoic · Silurian–DevonianSilurian–Devonian
Named by: Chaudhry et al. (1992)
Type locality: Not recorded
Thickness: Not recorded
Lithology: Not recorded
Synonyms: Not recorded

A Silurian–Devonian formation of the Bampokha Group, Lesser Himalaya.

Named by Chaudhry et al. (1992) for white-to-black marble with subordinate calc- and graphitic schist, the Tursak Formation is Lower–Middle Palaeozoic in age.

Fossils

Not recorded

Contacts

In the Khyber–Nowshera Belt column

MetamorphicLimestoneMixedConformable

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.

Distribution & setting

Khyber–Nowshera Belt

Basin: Northern Indus Suture
Region: Not recorded
Depositional environment: Not recorded
Coordinates: Not recorded

Correlation

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

Economic significance

Not recorded

Remarks

A Silurian–Devonian formation of the Bampokha Group, exposed in the Lesser Himalaya south of the Main Central Thrust.

Sources (1)

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

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: Appears in a single-author Geological Survey of Pakistan memoir (Malkani & Mahmood 2017), not cross-confirmed against the Shah lexicon. The Stratigraphic Committee of Pakistan is largely inactive, so documented provenance — not formal ratification — is the available signal.

Cite this unit

APA

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

BibTeX

@misc{stratigraphypk_tursakformation,
  author    = {Qudsi, Lareb},
  title     = {{Tursak Formation} --- 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/tursak-formation (accessed September 5, 2026).

To cite the unit's original definition instead, see: Chaudhry et al. (1992).

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Girarai Formation