The Cintura Formation is a
geologic formation in the northeastern
Sonora
Sonora (), officially Estado Libre y Soberano de Sonora ( en, Free and Sovereign State of Sonora), is one of the 31 states which, along with Mexico City, comprise the Administrative divisions of Mexico, Federal Entities of Mexico. The state is d ...
of
Arizona and
Mexico.
It preserves
fossils
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in ...
dating back to the
Cretaceous period.
Description
The Cintura Formation is divided into 3 stratigraphic members which represent
deltaic depositional elements: the basal Marquechi Member, medial San Marcos Member and the uppermost San Juan Member.
The delta is thought to have prograded southward and have an immediate source to its north based on
paleocurrents and provenance data.
Fossil content
See also
*
List of fossiliferous stratigraphic units in Arizona
*
Paleontology in Arizona
References
*
Cretaceous Arizona
{{Cretaceous-stub