Limestone units of the Tethyan Permian eugeosynclinal sequences of northwestern Washington and southwestern British Columbia contain abundant specimens of calcareous algae. The limestone bodies are mostly lenticular in shape and range from a few inches to approximately 1,000 feet thick. They are interbedded with volcanic flows and breccias, tuffs, ribbon cherts, argillites, conglomerates, graywackes, and lithic sandstones which may reach a thickness of 10,000 feet or more.

Limestones of Wolfcampian age on Orcas Island, Washington, contain Mizzia in association with bryozoa and the fusulinids Schwagerina and Pseudofusulinella. Limestones of probable early Guadalupian age on the south side of Mount Pilchuck in Snohomish County, Washington, contain Mizzia and Gyroporella associated with the fusulinids Cancellina and Schubertella. Upper Guadalupian age limestones of San Juan Island and western Snohomish County, Washington, contain Mizzia and other green algae associated with fusulinids of the Neoschwagerina-Verbeekina zone. The youngest Permian limestone, containing the Yabeina fusulinid zone (Ochoan?), near Granite Falls, Washington, and near Ashcroft, British Columbia, contains Mizzia and several other dasyclads.

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