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.^[1] Fossils of the marine crocodylian "Steneosaurus" as well as bivalves and the ammonite Nejdia have been found in the formation.^[2][3] The name Kandreho Formation was proposed by Geiger in 2004.^[4]

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
Kandreho Outcrop of the formation in Madagascar

Fossils

Crocodyliformes

Genus	Species	Location	Material	Notes	Images
"Steneosaurus"[1]	S. sp.	Behazonaty	Upper jaw fragment	A thalattosuchian mesoeucrocodylian. The genus Steneosaurus is a wastebasket taxon and the current referral of this specimen is unknown	Example of coeval Thallatosuchian also referred to Steneosaurus, Macrospondylus

See also

• List of fossiliferous stratigraphic units in Madagascar
• Geology of Madagascar
• Isalo III Formation