[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.

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