Abstract
The carbonates and fine siliciclastics of the Mid-Cambrian (Marjuman) Pika Formation in the southern Canadian Rocky Mountains provide an important record of inner-shelf trilobite biofacies. The faunas are characterized by low diversity and, in contrast to the more diverse open-shelf faunas of other parts of North America, agnostid trilobites are absent. A new biostratigraphic framework of two zones and two informal faunas is proposed for use in inner-shelf settings. Twenty-seven collections from three sections yielded at least eight genera and thirteen species; Marjumia bagginsi is a new species.
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