Drazinda Fm
Type Locality and Naming
Ghazij Gr – uppermost (eighth) formation in Sulaiman Province (SP). Holotype section: Drazinda village. Hypo: Dhurwali Chur. Author: W.R. Hemphill and A.H. Kidwai, 1973. Reference section: Same lithology as in the type section.
Lithology and Thickness
Claystone. It consists of dark brownish to chocolate color shale, claystone, siltstone and marl. Marl intercalations increase up section where gypsum stringers also appear. Fossiliferous brownish limestone beds are present in the middle part. In the Gomal Pass, a greenish grey calcareous sandstone bed of about 10m thickness appears in the middle part. Celestite nodules and gypsum stringers are common in the northern part of Sulaiman Range.
Thickness: 15-500 m. Maximum thickness estimated in Drazinda area is 500 m. It is 400 m thick at the Domanda Post but only 15 m in Jandola and completely wedges out in the Spin Ghora (S. Waziristan). 110-120 m was drilled in the Sui gasfield.
Relationships and Distribution
Lower contact
Conformably underlain by Pirkoh Fm
Upper contact
Conformably overlain by Nari Fm (Oligocene).
Regional extent
The formation occurs as a recognizable unit from Marri-Bugti Hills to all along the eastern Sulaiman Range towards north. This formation along with Pirkoh Fm and Domanda Fm wedges out in the Spin Ghora Range in South Waziristan. It is encountered in Sui and other gas-fields to the south.
GeoJSON
Fossils
The formation is highly fossiliferous comprising foraminifera, bivalves and echinoids. Middle Eocene restricted pelecypods are Nucula (lamellincula) depressilunulata, N. (saccela) pakistanica, Barbatia (plagiarea) pseudonavicula, Noetia magnifica, Chlamys cf. soriensis, C. cf. wynnie, Venerecardia soriensis, Chama zindapiri, Diplodonta pakistanica; and gastropods species, such as Turritella soriensis, T. (haustator) inbricataria, T. stiracoplus pakistanica and Motyris pseudoaralica.
Age
Depositional setting
The formation reflects deposition under high stand conditions.
Additional Information