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°30′S 45°18′E / 17.5°S 45.3°E / -17.5; 45.3
Approximate paleocoordinates	22°18′S 24°00′E / 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 class=notpageimage| 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

References

1. Buffetaut, Eric; Termier, Geneviéve; Termier, Henri (1981). "A teleosaurid (Crocodylia, Mesosuchia) from the Toarcian of Madagascar and its palaeobiogeographical significance" (PDF). Paläontologische Zeitschrift. 55 (3–4): 313–319. doi:10.1007/bf02988145. ISSN 0031-0220.
2. Behazonaty, SW of the basin of the Kelifely at Fossilworks.org
3. Buffetaut et al., 1981, p.314
4. Geiger, 2004, p.125

Bibliography

• Buffetaut, É.; Termier, G.; Termier, H. (1981), "A teleosaurid (Crocodylia, Mesosuchia) from the Toarcian of Madagascar and its palaeobiogeographical significance" (PDF), Paläontologische Zeitschrift, 55 (3–4): 313–319, Bibcode:1981PalZ...55..313B, doi:10.1007/BF02988145, retrieved 2018-08-30
• Geiger, Markus (2004), Sedimentary and stratal patterns in Jurassic successions of western Madagascar - Facies, stratigraphy, and architecture of Gondwana breakup and drift sequences (PhD thesis) (PDF), Universität Bremen, pp. 1–179, retrieved 2018-08-30