Agua Nueva Formation

Geologic formation from the Cretaceous period

Agua Nueva Formation
Stratigraphic range: Late Cenomanian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Formation
Lithology
Primary	Limestone
Other	Shale. bentonite, chert
Location
Country	Mexico
Extent	San Luis Potosí

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."^[1] The formation is noted for its qualities as a Konservat-Lagerstätte, with notable finds including the plesiosaur Mauriciosaurus and shark Aquilolamna.

References

^ Blanco, Alberto; Ángeles-Trigueros, Susana Abigail; Hernández-Ávila, Juan; Silva-Martínez, Luis E.; Zavala-Díaz de la Serna, Francisco Javier; Ambrocio-Cruz, Silvia Patricia; Castañeda-Posadas, Carlos; Blanco, Alberto; Ángeles-Trigueros, Susana Abigail; Hernández-Ávila, Juan; Silva-Martínez, Luis E. (2016). "Microscopic biomorphic structures in Upper Cretaceous marine sedimentary pyrite". Revista Mexicana de Ciencias Geológicas. 33 (3): 378–386. ISSN 1026-8774.