Mesozoic • Cretaceous formation Literature

Peshmal Schists

Mid-Cretaceous (basal Jaglot Group)

Kohistan Arc · Northern Greenstone Belt

Cited in 2 sources Last reviewed Jul 30, 2026

Unit summary

Rank: formation
Status: Published
Age: Mesozoic · CretaceousMid-Cretaceous (basal Jaglot Group)
Named by: Sullivan et al. (1993)
Type locality: Peshmal, Swat Valley.
Thickness: Not recorded
Lithology: Quartz-bearing volcaniclastic (superficially greywacke-like) sediments with well-developed graded bedding; calc-alkaline arc-type provenance.
Synonyms: Not recorded

The Peshmal Schists are the basal quartz-bearing volcaniclastic sediments of the Jaglot Group in Swat (local name of Sullivan et al. 1993), indicating a subaerial quartz-rich terrigenous source; they preserve well-developed graded bedding and have a calc-alkaline arc-type provenance, recording the earliest stages of Jaglot back-arc basin growth.

Fossils

Not recorded

Contacts

Lower contact — not recorded; upper contact — conformable.

In the Kohistan Arc column

ConglomerateIgneousLimestoneConformable

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

Kohistan Arc

Basin: Kohistan Arc
Region: Northern Greenstone Belt
Depositional environment: volcanic-arc, marine
Coordinates: Not recorded

Correlation

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

Economic significance

Not recorded

Remarks

A named constituent of the newly-defined Jaglot Group (its basal unit in Swat); turbidites carried into a medium-to-deep-water back-arc basin during early crustal stretching.

Sources (1)

Treloar, P.J., Petterson, M.G., Jan, M.Q. & Sullivan, M.A. (1996). A re-evaluation of the stratigraphy and evolution of the Kohistan arc sequence, Pakistan Himalaya. Journal of the Geological Society, London, 153, 681-693.

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: Defined in journal or other literature; not found in a GSP memoir. There is no body currently ratifying unit status, so provenance is shown in place of a formal ruling.

Cite this unit

APA

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

BibTeX

@misc{stratigraphypk_peshmalschists,
  author    = {Qudsi, Lareb},
  title     = {{Peshmal Schists} --- 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/peshmal-schists (accessed September 5, 2026).

To cite the unit's original definition instead, see: Sullivan et al. (1993).

Above · younger

Jaglot Group

Jurassic–Cretaceous