Abundant dasycladacean algae are present in Upper Permian limestone units of northwestern Washington and southwestern British Columbia. The limestones are in the Marble Canyon Formation (British Columbia) and the Stillaguamish Group (Washington). Five genera (Mizzia, Macroporella, Gyroporella, Oligoporella and Physoporella) are represented, of which Mizzia is the most abundant and widely distributed. This is the first Permian algal flora described from this part of North America, and it corresponds in composition with a Japanese flora of the same age.

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