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 ~ | |
| Type | Geological formation |
| Lithology | |
| Primary | Marly limestone |
| Location | |
| Coordinates | 17°30′S 45°18′E / 17.5°S 45.3°E |
| Approximate paleocoordinates | 22°18′S 24°00′E / 22.3°S 24.0°E |
| 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 | |
Fossils
editCrocodyliformes
edit| Genus | Species | Location | Material | Notes | Images |
|---|---|---|---|---|---|
| "Steneosaurus"[1] |
|
Behazonaty | Upper jaw fragment | A thalattosuchian mesoeucrocodylian. The genus Steneosaurus is a wastebasket taxon and the current referral of this specimen is unknow |  |
See also
edit- List of fossiliferous stratigraphic units in Madagascar
- Geology of Madagascar
- Isalo III Formation
- Bemaraha Formation
- Toarcian turnover
- Toarcian formations
- Marne di Monte Serrone, Italy
- Calcare di Sogno, Italy
- Sachrang Formation, Austria
- Posidonia Shale, Lagerstätte in Germany
- Ciechocinek Formation, Germany and Poland
- Krempachy Marl Formation, Poland and Slovakia
- Lava Formation, Lithuania
- Azilal Group, North Africa
- Whitby Mudstone, England
- Fernie Formation, Alberta and British Columbia
- Whiteaves Formation, British Columbia
- Navajo Sandstone, Utah
- Los Molles Formation, Argentina
- Mawson Formation, Antarctica
- Kota Formation, India
- Cattamarra Coal Measures, Australia
References
edit- ^ a b Buffetaut, Eric; Termier, Geneviéve; Termier, Henri (1981). "A teleosaurid (Crocodylia, Mesosuchia) from the Toarcian of Madagascar and its palaeobiogeographical significance". Paläontologische Zeitschrift. 55 (3–4): 313–319. doi:10.1007/bf02988145. ISSN 0031-0220.
- ^ Behazonaty, SW of the basin of the Kelifely at Fossilworks.org
- ^ Buffetaut et al., 1981, p.314
- ^ Geiger, 2004, p.125
Bibliography
edit- 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