141 PLATE XII. A. Exposure of bituminous sand on the north side of Steepbank river, 34 miles from its mouth, illustrating typical massive structure and cleavage of many of the high-grade deposits. (Pages 67 and 87.) B. Exposure on the north side of Steepbank river, 2 miles from its mouth, showing low-grade and banded bituminous sand, overlying Devonian limestone. (Pages 67 and 87.)