Paleozoic • Ordovician formation In GSP lexicon

Jobra Formation

Early–Middle Ordovician

Northern Indus Suture

Cited in 6 sources Last reviewed Jul 28, 2026

Unit summary

Rank: formation
Status: Published
Age: Paleozoic · Ordovician · Early–Middle OrdovicianEarly–Middle Ordovician
Named by: Stauffer (1968a)
Type locality: Misri Banda, Nowshera area34.5836°N, 72.3956°E
Thickness: 175 m
Lithology: Grey to pinkish, cross-bedded feldspathic quartzite with subordinate argillite, a basal conglomerate, and crinoidal limestone with dark phyllite in the upper third.
Synonyms: Misri Banda Quartzite

The Ordovician Misri Banda Quartzite near Nowshera, with Cruziana trace fossils, above the Ambar dolomite.

The Jobra Formation (DiPietro, 1990; Swat area, southeast of Ilam) is a proposed synonym of the Nowshera Formation (Stauffer, 1968) and corresponds to the Misri Banda Quartzite of the Nowshera hills — quartzite with limestone and argillite. It is dated Early–Middle Ordovician on the trace fossil Cruziana rugosa (Pogue et al., 1992; Kazmi & Jan, 1997) and rests unconformably on older (Cambrian?) rocks.

Fossils

Cruziana rugosa

Contacts

In the Khyber–Nowshera Belt column

MetamorphicLimestoneFossils recordedConformable

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: marine
Coordinates: 34.5836°N, 72.3956°E

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Correlation

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

Economic significance

Not recorded

Remarks

The Misri Banda Quartzite of the Nowshera area — a cross-bedded feldspathic quartzite carrying the trace fossil Cruziana rugosa (Early–Middle Ordovician) — resting unconformably on the Cambrian Ambar Formation and overlain unconformably by the Panjpir Formation.

Sources (5)

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.
OpenStreetMap contributors and GEOnet Names Server (public geographic gazetteers), used to geolocate named GSP type localities to approximate decimal coordinates.
DiPietro, J.A., Pogue, K.R., Lawrence, R.D., Baig, M.S., Hussain, A. & Ahmad, I. (1993). Stratigraphy south of the Main Mantle Thrust, Lower Swat, Pakistan. In: Treloar, P.J. & Searle, M.P. (eds), Himalayan Tectonics. Geological Society, London, Special Publications, 74, 207-220.
Shah, S.M.I. (2009). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 22.

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: 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.

Cite this unit

APA

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

BibTeX

@misc{stratigraphypk_jobraformation,
  author    = {Qudsi, Lareb},
  title     = {{Jobra 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/jobra-formation (accessed August 30, 2026).

To cite the unit's original definition instead, see: Stauffer (1968a).

Below · older

Ambar Formation

Cambrian

Above · younger

Panjpir Formation

Ordovician–Silurian