During Bajocian times, a narrow seaway stretched between eastern Africa and western Madagascar, much in the same position as today's Mozambique Channel.

The facies in the eastern belt is made up mainly of fine-grained and well-bedded limestones with the average thickness of the individual beds being a few tens of centimeters.

[4] In the south-western Majunga Basin, interbedded limestones and mudstones (shales and marls) above the Aalenian Sandstone were attributed to a Bajocian carbonate platform formed by the Bemaraha Formation.

The carbonate platform at the Manambolo and Tsiribihina River gorges, which cut through the Bemaraha plateau, are likewise assigned to the Early Bajocian.

Farther south at Besabora (along National Road RN35), limestones with the foraminifera Mesoendothyra croatica and Protopeneroplis striata support a Middle Jurassic (Bajocian to Early Bathonian) age.