Previously unknown species of belemnites and bivalves, including Arctic taxa, were identified in the Middle Jurassic of the Bureya sedimentary basin. It has been established that the scenario of enrichment of bivalve assemblages in the Bajocian deposits of the Far East up the section is very similar to that in the Middle Jurassic of Siberia. A micropaleontological characteristic of the Middle Jurassic of the Bureya sedimentary basin was obtained for the first time.