Khadro Fm

Kanikot Gr – lower formation. Holotype section: Bara Nai, northern Laki Range. Author: M. D. Williams, 1959. Reference section: None.

Synonym: Cardita beaumonti beds

Clayey sandstone. The formation consists of sandstone and shale that is ferruginous and calcareous. The sandstone is olive, yellowish brown, grey and green, soft, medium grained, ferruginous and contains thin interbeds of grey to brown clayey, in places sandy, limestone in the lower half of the formation. Both sandstone and limestone are fossiliferous. At the type locality, the basal part contains dark limestone bed with oysters and reptile bones. At Karakh and Jakker, the formation consists dominantly of interbedded soft, brown and olive shale and grey to green, well bedded sandstone.

Thickness: In type section where at least two basaltic flows are present in the lower part, a thickness of 67 m is reported. In old wells drilled in Badin area a combined thickness of Khadro/volcanics has been reported and even basalt has sometimes been reported as Khadro Fm. It has resulted in erroneous reporting of the presence of Khadro or large thickness of basalt in literature, particularly for offshore wells where only thick Ranikot has been reported in well reports, as mentioned above. However, on the basis of large thickness of Ranikot in offshore it is assumed that Khadro Fm would also be increasing in thickness south of the type section.

Corbula (Varicorbula) harpa, Leionucula rakhiensis, Venerecardia vredenburgi, Tibia (Tibiochilus) are reported by Eames (1952) from Rakhi Nallah; Danian foraminifers like Globigerina pseudobulloides and G. triloculinoides have been recorded by Nagappa (1959). I t may extend down into Late Cretaceous as indicated by the presence of Globotruncana reported by HSC (1960).