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La Caja Formation
Geologic formation in Mexico From Wikipedia, the free encyclopedia
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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 ichthyosaurs Ophthalmosaurus icenicus and Parrassaurus yacahuitztli, metriorhynchid Cricosaurus saltillensis, and the giant pliosaur "Monster of Aramberri" are known from the formation.[4][5][6][7]
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