Chorgali Fm

Charrat Gr – upper formation in Trans Indus-Potwar Province (TrI-PP). Holotype section: Chorgali Pass, Khairi Murat Range. Author: E. H. Pascoe, 1920. Reference section: None.

Clayey limestone. The formation is divisible in two distinct units in the type section. The Lower part consists of shale and limestone, while the Upper part is mainly limestone. The shale of the lower part is greenish grey or buff and calcareous, and the limestone is light grey and argillaceous. In the Upper unit the limestone is white or cream color, porcellanous and well bedded. In the Hazara area, the formation is composed of thinly interbedded limestone and marl, which are light to pale grey and weather light yellow to cream. In Kalachitta Range, the limestone is slightly nodular and contains chert lenses. In the Salt Range also the formation is divisible into two units. The lower part consists of shale and limestone, while the upper part is mainly limestone.

Thickness: 15-150 m. It is 150 m at the type section, 30 m in Tarki, 15 m at Bahadur Khel and about 45 m in southeastern Hazara.

Richly fossiliferous. Forams include Assilina leymeriei, A. spinosa, A. daviesi Fasciolites oblonga, Flosculina globosa, Globorotalia reissi, G. wilcoxsensis, Globogerina prolata, Lockhar tia conditi, L. hunti, L. tipperi, Nummulites atacicus, N. mamilla etc.

EMW: Oil and gas shows.