Alluvial fan facies, braided stream delta facies and flooded plain facies are developed in Kongdian Formation of Bamianhe area.
In northwestern Madagascar, the Betsiboka River flows toward the coast, its braided streams emptying into the Bombetoka Bay.
The fault subsidence lacustrine died out in late-Jurassic and damp type fan, braided stream and meander river sedimentary sequence was formed.