Paleozoic • Ordovician formation GSP memoir

Thalle Limestone

Ordovician

Karakoram-Hindukush Basin · Central Karakoram Batholith

Ordovician in the time scale →

Cited in 3 sources Last reviewed Jul 16, 2026

Unit summary

Rank: formation
Status: Published
Age: Paleozoic · OrdovicianOrdovician
Named by: Not recorded
Type locality: Thalle valley, northeast of Khapalu, Skardu district35.3194°N, 76.1686°E
Thickness: Not recorded
Lithology: Crystalline limestone (marble).
Synonyms: Not recorded

A marble unit of the Thalle valley near Khapalu; little is firmly known about it.

Thalle limestone is named after the Thalle valley, NE of Khapalu.

Fossils

Not recorded

Contacts

In the Karakoram column

MetamorphicMixedLimestoneFossils recordedConformableUnconformity

Band colour = period; texture = dominant rock type. Lines between bands mark the contact type (wavy = unconformity inferred from a missing period). 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

Karakoram

Basin: Karakoram-Hindukush Basin
Region: Central Karakoram Batholith
Depositional environment: Not recorded
Coordinates: 35.3194°N, 76.1686°E

Google Maps ↗ OpenStreetMap ↗

Correlation

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

Economic significance

Not recorded

Remarks

A poorly characterised crystalline-limestone (marble) unit of the Thalle valley; its age and stratigraphic relations are not well established (limestone and schist of the Thalle valley have been variously dated as Lower Paleozoic).

Sources (4)

Rolland, Y. et al. (2000); Le Fort, P. & Pêcher, A. (2001). Lower Ordovician graptolites/crinoids in Karakoram marble horizons.
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.
OpenStreetMap contributors and GEOnet Names Server (public geographic gazetteers), used to geolocate named GSP type localities to approximate decimal coordinates.

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: Appears in a single-author Geological Survey of Pakistan memoir (Malkani & Mahmood 2017), not cross-confirmed against the Shah lexicon. The Stratigraphic Committee of Pakistan is largely inactive, so documented provenance — not formal ratification — is the available signal.

Cite this unit

APA

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

BibTeX

@misc{stratigraphypk_thallelimestone,
  author    = {Qudsi, Lareb},
  title     = {{Thalle Limestone} --- 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/thalle-limestone (accessed August 30, 2026).