Sarobi Formation
Early to Middle Jurassic (Pliensbachian-Bajocian; ~192.9-168.17 Ma)
Jurassic in the time scale →Cited in 3 sources Last reviewed Jul 18, 2026
- Rank
- formation
- Status
- Published
- Age
- Mesozoic · Jurassic · Early to Middle JurassicEarly to Middle Jurassic (Pliensbachian-Bajocian; ~192.9-168.17 Ma)
- Named by
- Ahmad et al. (2000)
- Type locality
- North of Sarobi village, along Isha-Razmak road32.9056°N, 70.1097°E
- Thickness
- 400+ m
- Lithology
- Clayey limestone. The formation comprises a sequence of alternating limestone and shale. At the type locality, its lower part is predominantly limestone, while the upper part is shale. The limestone is thin bedded, occasionally thick bedded, micritic and grey to dark grey; it weathers to brownish grey and yellowish brown color. The limestone is very hard and forms ridges. It is fine crystalline t…
- Synonyms
- Not recorded
Clayey limestone. The formation comprises a sequence of alternating limestone and shale. At the type locality, its lower part is predominantly limestone, while the upper part is shale. The limestone is thin bedded, occasionally thick bedded, micritic and grey to dark grey; it weathers to brownish grey and yellowish brown color. The limestone is very hard and forms ridges. It is fine crystalline to fairly coarse grained, with shelly, oolitic, peletic and pisolitic interbeds. The shale is flaky, slaty, splintery, papery and black on fresh surface and weathers to greenish grey, dark grey and bro…
Fossils
Not recorded
Contacts
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
- Basin
- Not recorded
- Region
- Not recorded
- Depositional environment
- Not recorded
- Coordinates
- 32.9056°N, 70.1097°E
Correlation
Not recorded. Compare this unit against other basins on the correlation panel →
Economic significance
Not recorded
Remarks
Not recorded
Sources (3)
- Indian Plate Lexicon (indplex.geolex.org), Geological Society of India and international compilation.
- Ahmad, S., Ali, F., Rehman, N. & Gul, J. (2000). Lithostratigraphy of the Kurram Group along the Mirali-Miran Shah Road, North Waziristan Agency, NWFP, Pakistan. Geological Bulletin, University of Peshawar, 33, 79-86.
- Shah, S.M.I. (2009). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 22.
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.
Cite this unit
Qudsi, L. (2026). Sarobi Formation. In Pakistan Stratigraphy Dataset [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21363991
@misc{stratigraphypk_sarobiformation,
author = {Qudsi, Lareb},
title = {{Sarobi 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/sarobi-formation (accessed August 30, 2026).
To cite the unit's original definition instead, see: Ahmad et al. (2000).
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