Publisher: ИГ Коми НЦ УрО РАН , Place of publication: Сыктывкар , Уear of publication: 2020

Encrusters and borings on the shells of Gryphaea lucerna from the Middle Callovian of the Fokino section are briefly discussed. Encrusters are represented by oysters Nanogyra, Deltoideum and Actinostreon, few bryozoans and by the assemblage of calcareous tubeworms, dominated by the serpulid "Filogranula" runcinata. Boring traces are represented by the polychaete borings Meandropolydora, foronid borings Talpina, and bivalve borings Gastrochaenolites as well as by the microborings Calcideletrix. Spatial distribution of encrusters and borings on the shells of Gryphaea suggests that these shells were slightly transported from their original habitat and turned over by storm activity prior to burial.