KrolC Fm

Simla (Shali Basin), Himachal Pradesh-Uttarakhand, the name Krol Series was first given by Medlicott (1864) to a series of limestone, red and green shales and sandstones seen in the Krol Mountain near Solan in Simla area. [Original Publication: Auden, J.B.,1934. The geology of the Krol Belt. Rec. Geol. Surv. Indi. 67, 357-454.]

[Figure: Krol Gr lithology table (provided by O.N. Bhargava & Birendra Singh)]

Dolomitic limestone. It is represented by dolostone, cherty limestone and shale. The exposures around Solan form a conspicuous cliff. Carbonate rock is a massive, dark blue foetid dololutite and calcilutite. It has a characteristic elephant skin weathering. It varies in thickness from 140 m in parts of Pachmunda Hill to over 220 m in the Krol Hills.

Not Available

The basal part of the KrolC represents subtidal mixed siliciclastic and carbonate ramp or open shelf environment (Jiang et al., 2003b), which changed in upper part to intertidal back barrier, shelf lagoon and sand shoal on a ramp to tidal flat-barrier. Intertidal to supratidal flats of an embayment with somewhat hypersaline conditions led to the precipitation of gypsum along with carbonates. Detailed sequence stratigraphic studies identified several disconformable surfaces (Jiang et al. 2002) indicating interruptions in largely tidal to intertidal (Singh 1980) sedimentation in a shallow NW-sloping marine Krol Basin, with minor phases of deep-water environment (Jiang et al. 2003). Main carbonate microfacies are mudstone, peloidal packstone, ooidal grainstone, wackestone and stromatolitic boundstone (Srikantia and Bhargava, 2020; Jain et al., 2020).

See Srikantia and Bhargava, 2021; Jain et al., 2020 and Jiang et al., 2002.