Drug Fm
Type Locality and Naming
Ghazij Gr – third formation in Sulaiman Province (SP). Holotype section: Drug Tangi. Author: Jamil-ud-Din, Kidwai and Sibghatullh, 1968 (unpublished field notes), and M.W.A. Iqbal, 1969. Reference section: None.
Synonym: Towards south, in the Sui gasfield Drug Formation's equivalent is gas bearing, which is called Sui Upper Limestone Fm (Siddiqui, 2004).
Lithology and Thickness
Limestone. The formation consists of limestone of pale orange to green color, weathering to white chalky. In the central Zindapir area, pale olive to green blue claystone and shale occur in the upper part, however, in Rakhi Nallah the upper part consists of yellowish grey limestone, which is medium to very coarse grained, crystalline, nodular and has marly laminated partings.
Thickness: 70-400 m. At the type section, the formation is 400 m thick, 340 m at Zindapir section and 300 m at Rakhi Nallah. Northwards in the Moghal Kot section it is most likely absent or reduced considerably in thickness. In subsurface it is correlated with Sui Upper limestone of PPL (Siddiqui, 2004), as named in the Sui gasfield where it attains a thickness of about 70 m.
Relationships and Distribution
Lower contact
Conformably overlain by Baska Fm
Upper contact
Conformably underlain by Shaheed Ghat Fm throughout, but in Moghal Kot section underlain by Toi Fm
Regional extent
The formation is exposed only in the eastern Sulaiman Range. The formation, because of its bright reflectance between dark colored shales and linear continuity can be easily traced along Zindapir anticline. On the eastern flank of the Fort Munro anticline the formation can be traced from its southern plunge at Giandari to at least up to 31° 10' N; North of this latitude only younger thin beds of Middle-Late Eocene carbonates (Habib Rahi Fm and Pirkoh Fm) can be traced on satellite imagery.
GeoJSON
Fossils
Gastropods: Euspirocrommium oveni, Cancelluria soriensis, Ringicuia pseudopunjabenesis; Pelecypods: Lucina exquisica.
Age
Depositional setting
Additional Information
EMW: Gas producer.