La Caja Formation
Geologic formation in Mexico
From Wikipedia, the free encyclopedia
The La Caja Formation is a geologic formation in Mexico. It preserves fossils dating from the Kimmeridgian to the lower Berriasian.[1] La Caja Formation is widespread in northeastern and central Mexico and known for their abundant and diverse well-preserved ammonites. It was deposited in hemipelagic conditions, and predominantly consists of siliclastic sediments, including marl, with limestone.[2] It is laterally equivalent to the La Casita Formation, which represent more proximal facies.[3] The ichthyosaur Parrassaurus yacahuitztli, metriorhynchid Cricosaurus saltillensis, and the giant pliosaur "Monster of Aramberri" are known from the formation.[4][5][6][7]
| La Caja Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Formation |
| Underlies | Taraises Formation |
| Overlies | Zuloaga Formation |
| Thickness | Around 60 metres |
| Lithology | |
| Primary | Marl |
| Other | Limestone, Siltstone, Sandstone, Shale |
| Location | |
| Country | Mexico |
