The present study is based on extensive sampling from an olistolith located near Castle Peak in the Taseko Lakes map area (British Columbia, Canada). The fauna is diverse and well preserved and similar to that illustrated from Monte Cetona in Italy by Fucini (1903).

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Coroniceras (Paracoroniceras) mutabile new species is the most abundant species of the assemblage found in the olistolith, where the ammonite association indicates an age corresponding with the Turneri Zone of the Early Sinemurian of the Northwest European zonation.

C. (P.) mutabile apparently complicates the still poorly understood systematics of the...

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