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.[1][2] The name Kandreho Formation was proposed by Geiger in 2004.[3]

Kandreho Formation Stratigraphic range: Toarcian ~180–176 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Lithology
Primary	Marly limestone
Location
Coordinates	17.5°S 45.3°E / -17.5; 45.3
Approximate paleocoordinates	22.3°S 24.0°E / -22.3; 24.0
Region	Mahajanga Province
Country	Madagascar
Extent	Mahajanga Basin
Type section
Named for	Kandreho
Named by	Geiger
Year defined	2004
Outcrop of the formation in Madagascar