Shekhan Fm
Type Locality and Naming
Charrat Gr – second formation in Kohat-Margala Province (Ko-MP). Holotype section: Shekhan Nallah. Author: L.M. Davies, 1926. Reference section: None.
Lithology and Thickness
Shallow-marine marl. The formation consists of limestone and shale. At the type section, the limestone is yellowish grey to grey, thin-bedded to massive and nodular. The shale is gypsiferous; limestone and shale occur as interbeds in the upper part. At Tarkhobi the limestone is dominant lithology in the lower part. At Panoba Nallah, limestone with shale partings occurs in the lower part and is followed by dusky yellow shale, which is capped by clayey limestone with gypsum beds near the top. At Mami Khel, finely crystalline and light grey limestone occupies the lower part and is followed by shale in the upper part.
Thickness: 30-70 m. At the type section it is 54 m thick, 30 m at Mami Khel and 70 m at Panoba.
Relationships and Distribution
Lower contact
Conformably underlain by Panoba Shale Fm
Upper contact
Conformably overlain by Kuldana Fm
Regional extent
The outcrops of the formation are restricted to the Kohat area and pinch out southwestwards.
GeoJSON
Fossils
Larger foraminifera include Alveolina oblonga, Assilina daviesi, A. laminosa, Nummulites atacicus and Orbitolites complanatus. These fossils indicate an Early Eocene age.
Age
Depositional setting
It was deposited under shallowing upwards settings ranging from subtidal to supratidal environments (Tanoli et al., 1993 as in Shah, 2009).
Additional Information