Saindak Fm

Holotype section: Exposures in the large Mirjawa synclinorium near Saindak. Author: Hunting Survey Corporation, 1960. Reference section: None.

Sandy claystone. The formation consists of interbedded shales, sandstone, limestone and minor volcanic conglomerate in the western part of the province. The shale is green, yellowish brown, greenish grey brown and calcareous. The limestone is usually dark grey, yellowish brown and weathers light grey, and is fossiliferous. In some places, the red shale contains beds of white and fairly pure gypsum.

Thickness: 60-1,500 m. The maximum thickness of the formation is not less than 1,500 m. At Gwalishtap it reduces to only 60 m due to erosion.

Foraminifers include Assilina dandotica, A. exponens, Fasciolites oblonga, Linderina brugesi, Opertorbitolites douvileli etc., while Echinolampas nummulitica (echinoid) and Velates perversus (gastropod) are important among other fossils.