The lower part of the Upper Devonian of the Rocky Mountains is divided into a reef or carbonate sequence and an off-reef or clastic sequence. The latter is composed of the following succession: Lower Flume dark stromatoporoid and Amphipora beds; Upper Flume argillaceous limestone; dark Perdix shales and thin argillaceous limestone passing upward into argillaceous bedded limestone of the Mt. Hawk. These formations together are equivalent to the variable carbonate sequence of the Fairholme. The lower part of the Fairholme which consists predominantly of "black reef" is continuous with the Flume. Both the carbonate and clastic sequences are overlain by the dolomites and silts of the Alexo; these in turn are succeeded by the massive Palliser limestones.

Abstract by H. Belyea, G. S. C.

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