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Westrop, S.R., Landing, E., Ludvigsten, R., 1981. Upper Cambrian and Lower Ordovician Biostratigraphy, Jasper National Park, Alberta, The Cambrian System in the southern Canadian Rocky Mountains, Alberta and British Columbia. Guidebook for Field Trip 2. Second International Symposium on the Cambrian System. Golden, Colorado, Golden, Colorado.
Westrop, S.R., Landing, E., Ludvigsten, R., 1981. Upper Cambrian and Lower Ordovician Biostratigraphy, Jasper National Park, Alberta, The Cambrian System in the southern Canadian Rocky Mountains, Alberta and British Columbia. Guidebook for Field Trip 2. Golden, Colorado.