Agua Nueva Formation
The Agua Nueva Formation is a geologic formation in Mexico. It preserves fossils dating back to the upper part of the Cenomanian stage of the Cretaceous period. It consists "predominantly of alternating fossiliferous, organic matter-rich, laminated, dark gray limestone and non-laminated, organic matter-poor limestone in decimeter-thick beds (10 to 30 cm) with occasional centimetric beds (5 cm) of brown shale that show no apparent internal structures." The formation is noted for its qualities as a Konservat-Lagerstätte, with notable finds including the plesiosaur Mauriciosaurus and shark Aquilolamna.
| Agua Nueva Formation | |
|---|---|
| Stratigraphic range: Late | |
| Type | Formation |
| Lithology | |
| Primary | Limestone |
| Other | Shale. bentonite, chert |
| Location | |
| Country | Mexico |
| Extent | San Luis Potosí |
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