A systematic study of the Buchia fauna from Upper Jurassic and Lower Cretaceous strata of Andøy, northern Norway, indicates the presence of the upper Middle Volgian, probably most of the Upper Volgian, the uppermost Ryazanian, and all of the Valanginian. The Andøy succession, which is more
complete than hitherto assumed, can be successfully placed within the framework of the comprehensive Buchia zonation worked out for the Oxfordian-Valanginian of the Boreal Realm. The main breaks in the sequence, probably caused by the Late Kimmerian tectonic phase, seem to correspond to the Upper
Kimmeridgian and the Lower to lower Upper Ryazanian.