It comprises fine to coarse sandstones, siltstones, argillaceous limestone, nodular limestone and fine to coarse crinoidal grainstone
and marl (Fig.
microfacies represent the near shore, high energy, shallow water bar, beaches and shoals environments.
(MFl)-Brachiopod crinoidal grainstone
. This facies is bioclastic grainstone
and consists of brachiopod shells, bryozoans, ostracods, gastropods, crinoids and mollusks (Fig.
Arwa (Kimmeridgian to Tithonian) Fm is composed of argillaceous limestone, deep-water lime mudstone, and locally minor packstone, wackestone, grainstone
, and black shale.
The texture is grainstone
. It has been observed as brown on suggest that deposition occurred in a shallow and high energy environmentin the innershelf environlimestone in the upper part of the Khamir section.
The limestone can be illustrated as mudstone, wackstone, grainstone
, white to off white, cream, light gray, light brown, soft to firm, microcrystalline to fine crystalline, dolomitic and anhydritic in parts, and slightly argillaceous.
It is mimetically and/or nonmimetically replaced packstone/ grainstone
and its crystals are unimodal, nonplanar-anhedral.
SAMPLE 1: DOLOMITIZED OOID GRAINSTONE
WITH ISOPACHOUS DOLOMITE CEMENT