Sarobi Fm

Holotype section: North of Sarobi village, along Isha-Razmak road. Author: S. Ahmed et al., 2000. Reference section: None.

Clayey limestone. The formation comprises a sequence of alternating limestone and shale. At the type locality, its lower part is predominantly limestone, while the upper part is shale. The limestone is thin bedded, occasionally thick bedded, micritic and grey to dark grey; it weathers to brownish grey and yellowish brown color. The limestone is very hard and forms ridges. It is fine crystalline to fairly coarse grained, with shelly, oolitic, peletic and pisolitic interbeds. The shale is flaky, slaty, splintery, papery and black on fresh surface and weathers to greenish grey, dark grey and brownish grey colors.

Thickness: 400+ m. It is 400 m thick in the type locality.

The formation is fossiliferous, and has yielded bivalves, crinoids, belemnites, gastropods, bryozoans and corals.