In order to document the microfacies and diagenesis of the reefal limestone in the uppermost part of the
Callovian Tuwaiq Mountain Limestone Formation at Khashm Al-Qaddiyah area, central Saudi Arabia,
scleractinian corals and rock samples were collected and thin sections were prepared. Coral framestone,
coral floatstone, pelloidal packstone, bioclastic packstone, bioclastic wacke/packstone, algal wackestone
and bioclastic foraminiferal wacke/packstone were the recorded microfacies types. Cementation,