Precambrian • Precambrian formation In GSP lexicon

Chak 102 Conglomerate

Neoproterozoic

Indo-Pakistan Shield

Part of Sharaban Group

Precambrian in the time scale →

Cited in 4 sources Last reviewed Jul 18, 2026

Unit summary

Rank: formation
Status: Published
Age: Precambrian · PrecambrianNeoproterozoic
Named by: Alam et al. (1992)
Type locality: Sharban hill, about 18 km SE of Sargodha31.9369°N, 72.7781°E
Thickness: 190 m
Lithology: Conglomerate, dull rusty brown, with slate intercalations; pebbles of quartzite, slate and limestone in a calcareous matrix.
Synonyms: Sharaban Conglomerate; Sharaban Formation; Sharban Formation

A Precambrian conglomerate of the Kirana basement, SE of Sargodha.

The Chak 102 Conglomerate is a conglomerate unit of the Sharban Group of the Kirana area (the group named by Alam et al. 1992), overlying the Hadda quartzite. Associated units of the group include the Hadda quartzite (named after Hadda canal rest house; quartzites, slates, conglomerates and lava flows) and the Sharban Formation (named after Sharaban hill about 18 km SE of Sargodha; dominant conglomerates with minor lenses of fine-grained quartzite).

Fossils

Not recorded

Contacts

In the Indo-Pakistan Shield column

MetamorphicIgneousConglomerateContact not recorded

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

Indo-Pakistan Shield

Basin: Indo-Pakistan Shield
Region: Not recorded
Depositional environment: marginal marine, metamorphic
Coordinates: 31.9369°N, 72.7781°E

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Correlation

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

Economic significance

Not recorded

Remarks

A conglomeratic unit of the Sharban Group within the Precambrian Kirana Complex of the Indo-Pakistan shield basement.

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 (2)

Renamed from 'Sharaban Formation/Conglomerate' to the Chak 102 Conglomerate, the upper formation of the Sharaban Group in the revised Kirana Complex scheme of Chaudhry, Ahsan & Rehman (2022, Table 4). It overlies the Hadda Quartzite. Old names retained as synonyms.

Chaudhry, M.N., Ahsan, N. & Rehman, S.U. (2022)
Attested in Shah (2009), Geological Survey of Pakistan Memoir 22, which describes it as Sharaban conglomerate (Alam 1987; Shah names this unit "Sharaban conglomerate"). Adds the definitional GSP/SCP lexicon citation.

Shah, S.M.I. (2009)

Sources (4)

Malkani, M.S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 24.
OpenStreetMap contributors and GEOnet Names Server (public geographic gazetteers), used to geolocate named GSP type localities to approximate decimal coordinates.
Chaudhry, M.N., Ahsan, N. & Rehman, S.U. (2022). Revised Stratigraphy of Sargodha-Chiniot Area, Punjab, Pakistan. The Geological Bulletin of the Punjab University, 2022, pp. 1-9.
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.

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Cite this unit

APA

Qudsi, L. (2026). Chak 102 Conglomerate. In Pakistan Stratigraphy Dataset [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21363991

BibTeX

@misc{stratigraphypk_chak102conglomerate,
  author    = {Qudsi, Lareb},
  title     = {{Chak 102 Conglomerate} --- 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/chak-102-conglomerate (accessed October 29, 2026).

To cite the unit's original definition instead, see: Alam et al. (1992).

Below · older

Hadda Quartzite

Precambrian