Kandreho Formation

The Kandreho Formation is an Early Jurassic (middle or late Toarcian) geological formation of the Mahajanga Basin of Madagascar. The marly limestones of the formation were deposited in a subtidal lagoonal environment. The formation overlies the "Bouleiceras" and "Spiriferina" beds of the early Toarcian and has been correlated to the Marrat Formation of Saudi Arabia. Fossils of the marine crocodylian "Andrianavoay" (originally classed as a species of "Steneosaurus") as well as bivalves and the ammonite "Nejdia" have been found in the formation. The name Kandreho Formation was proposed by Geiger in 2004.