A new locality of Jurassic marine reptiles in the north of European Russia

A detailed description of the section of the Middle Jurassic terrigenous deposits exposed on the Yarenga River, Arkhangelsk Region, is provided. The section represents a new locality of fossil remains of Jurassic marine reptiles. Among them, the postcranial elements of the plesiosaur Muraenosaurus dominate. Pliosaur and ichthyosaur finds, each represented by a single bone, also occur in the assemblage. The palynological and micropaleontological data support the Early - Middle Bathonian age of the deposits. The lithological characters of the rocks and the presence of rare foraminifera indicate shallow marine environments. The significance of new discoveries for the fossil record of the Jurassic marine reptiles is briefly discussed.