Mesozoic • Cretaceous group In GSP lexicon

Yasin Group

Cretaceous

Kohistan-Ladakh Magmatic Arc · Northern Greenstone Belt

Cited in 5 sources Last reviewed Jul 30, 2026

Unit summary

Rank: group
Status: Published
Age: Mesozoic · Cretaceous · Aptian–AlbianCretaceous
Named by: Ivanac et al. (1956)
Type locality: Not recorded
Thickness: Not recorded
Lithology: Lavas, tuffs and agglomerates with lenses and beds of fossiliferous massive and shaly limestone.
Synonyms: Not recorded

The Cretaceous Yasin Group — arc lavas and tuffs with Orbitolina-bearing reef limestone — dating the Kohistan arc's shallow-marine stage.

Fossils

Orbitolina Rudists (Hippurites)

Contacts

In the Kohistan Arc column

Shale / mudMetamorphicIgneousConglomerateFossils recordedContact not recordedIntrusive

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

Kohistan Arc

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

Correlation

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

Economic significance

Not recorded

Remarks

A Cretaceous (Aptian–Albian) volcaniclastic and reefal-limestone succession of the Kohistan arc; its Orbitolina-bearing limestones date the arc's shallow-marine phase and trace it as an arcuate belt from Yasin through Gilgit to Ladakh.

Research notes (2)

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)

Treloar et al. (1996): the turbiditic Yasin Group is Albian–Aptian (c. 114 Ma; faunal age, Pudsey 1986) and overlies the Chalt Volcanic Group, recording back-arc crustal stretching preceding suturing to Asia.

Treloar, P.J., Petterson, M.G., Jan, M.Q. & Sullivan, M.A. (1996)

Sources (6)

Pudsey, C. J. (1986); Ivanac, J. F. et al. (1956). Yasin Group shelly limestones, Albian–Aptian fossils.
Malkani, M. S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Memoir of the Geological Survey of Pakistan, Vol. 24.
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.
Shah, S.M.I. (2009). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 22.
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: implications for magmatic and tectonic arc-building processes. Journal of the Geological Society, London, 153, 681-693.

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.

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Cite this unit

APA

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

BibTeX

@misc{stratigraphypk_yasingroup,
  author    = {Qudsi, Lareb},
  title     = {{Yasin Group} --- 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/yasin-group (accessed October 29, 2026).

To cite the unit's original definition instead, see: Ivanac et al. (1956).

Referenced in other successions

Underlain by Chalt Volcanic Group