A clay bed is interbedded with silts that form a terrace just west of the subdivision of Dallas, about 9 kilometres east of Kamloops. The clay is light brown, gritty and limy and is not suitable for use in the manufacture of ceramic products. A sample from a weathered portion of hard laminated silty clay that is calcareous with abundant fine grit and mica produced fair dry-press bricklets at cone 03, with 13.6 per cent absorption (Bulletin 30). Bedrock geology consists of argillite, sandstone and tuff of the Upper Triassic Nicola Group.