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 | |
|---|---|
| Type | Geological formation |
| Lithology | |
| Primary | Marly limestone |
| Location | |
| Coordinates | 17.5°S 45.3°E |
| Approximate paleocoordinates | 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 | |
Gallery
Reconstruction of Macrospondylus, a close relative of Andrianavoay
See also
- 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
- Behazonaty, SW of the basin of the Kelifely at Fossilworks.org
- Buffetaut et al., 1981, p.314
- Geiger, 2004, p.125
Bibliography
- Buffetaut, É.; G. Termier, and H. Termier. 1981. A teleosaurid (Crocodylia, Mesosuchia) from the Toarcian of Madagascar and its palaeobiogeographical significance. Paläontologische Zeitschrift 55. 313–319. Accessed 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), 1–179. Universität Bremen. Accessed 2018-08-30.
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