Precambrian • Precambrian formation GSP memoir

Sobrah Formation

Precambrian

Northern Indus Suture

Precambrian in the time scale →

Cited in 3 sources Last reviewed Jul 17, 2026

Unit summary

Rank: formation
Status: Under review
Age: Precambrian · PrecambrianPrecambrian
Named by: Not recorded
Type locality: Near Tarbela Dam, Khyber Pakhtunkhwa
Thickness: Not recorded
Lithology: Thin limestone unit overlying the Manki Formation near Tarbela Dam.
Synonyms: Not recorded

A poorly characterised formation of the Nowshera/Peshawar Paleozoic area.

Fossils

Not recorded

Contacts

In the Khyber–Nowshera Belt column

LimestoneMetamorphicConformable

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 formation of the Nowshera/Peshawar Paleozoic area; its lithology and age are not well established in the baseline.

Sources (2)

Malkani, M.S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 24.
Hylland, M.D., Riaz, M. & Ahmad, S. (1988). Geology of the Southern Gandghar Range, Pakistan. Geological Bulletin, University of Peshawar, Vol. 21, pp. 1-14.

Reviewer confidence: medium

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). Sobrah Formation. In Pakistan Stratigraphy Dataset [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21363991

BibTeX

@misc{stratigraphypk_sobrahformation,
  author    = {Qudsi, Lareb},
  title     = {{Sobrah 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/sobrah-formation (accessed August 30, 2026).

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Manki Formation