The Union Bay deposit consists of shale, probably of the Upper Cretaceous Nanaimo Group, Haslam Formation. The average air shrink- age of the material is 4.3 per cent and the average tensile strength 65 pounds per square inch. The clay when wet-moulded burns to a reddish-brown brick, of good ring, and moderate absorption. From fire tests of the material it was found that the clay is beyond vitrification at cone 3 and fused at cone 4. The clay was moulded into dry-press bricklets. These burned to a good red colour, but did not give a good hard body.