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Cintura Formation

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Geographic formation in Arizona
Cintura Formation
Stratigraphic range: Albian–Cenomanian PreꞒ O S D C P T J K Pg N
TypeGeological formation
Unit ofBisbee Group
Sub-unitsMarquechi, San Marcos and San Juan Member
Thickness1,146 meters
Location
RegionArizona and Sonora
Country United States,  Mexico
Type section
Named byRansome
Year defined1904

The Cintura Formation is a geologic formation in the northeastern Sonora of Arizona and Mexico. It preserves fossils 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

Dinoflagellates
Genus Species Presence Material Notes Images
Oligosphaeridium O. sp. Base of the Marquechi Member. Dinoflagellate cysts.
Plants
Genus Species Presence Material Notes Images
cf. Acanthotriletes cf. A. varispinosus Base of the Marquechi Member. Spores.
Alisporites A. sp. Base of the Marquechi Member. Pollen grains.
Araliaephyllum A. silvapinedae Near the town of Cabullona, Sonora, Mexico. A trilobed leaf. A laurale.
Baculatisporites B. sp. Base of the Marquechi Member. Spores.
Cicatricosisporites C. hallei Base of the Marquechi Member. Spores. A schizaeacean fern.
C. sp. Base of the Marquechi Member. Spores. A schizaeacean fern.
Classopollis C. spp. Base of the Marquechi Member. Pollen grains. A cheirolepidiaceaen conifer.
Clavatipollenites C. tenellis Base of the Marquechi Member. Pollen grains.
Cycadopites C. sp. Base of the Marquechi Member. Pollen grains.
Deltoidospora D. sp. Base of the Marquechi Member. Spores.
Ephedripites E. sp. Base of the Marquechi Member. Pollen grains.
Exesipollenites E. tumulus Base of the Marquechi Member. Pollen grains.
Inaperturopollenites I. sp. Base of the Marquechi Member. Pollen grains. A conifer.
Isoetites I. sp. San Juan Member. Leaves. An isoetalean.
Leptolepidites L. sp. 1 Base of the Marquechi Member. Spores. A fern.
L. sp. 2 Base of the Marquechi Member. Spores. A fern.
L. sp. 3 Base of the Marquechi Member. Spores. A fern.
Osmundacites O. wellmanii Base of the Marquechi Member. Spores.
Ovoidites O. parvus Base of the Marquechi Member. Spores. An aquatic zygnematale.
Patellasporites P. sp. Base of the Marquechi Member. Spores.
Perinopollenites P. sp. Base of the Marquechi Member. Pollen grains.
Peromonolites P. allensis Base of the Marquechi Member. Spores. A fern.
Pityosporites P. sp. Base of the Marquechi Member. Pollen grains.
Plicatella P. potomacensis Base of the Marquechi Member. Spores.
Raistrickia R. sp. Base of the Marquechi Member. Spores.
Retimonocopites R. sp. 1 Base of the Marquechi Member. Pollen grains.
R. sp. 2 Base of the Marquechi Member. Pollen grains.
Spheripollenites S. sp. Base of the Marquechi Member. Pollen grains.
Taxodiaceaepollenites T. hiatus Base of the Marquechi Member. Pollen grains.
Todisporites T. minor Base of the Marquechi Member. Spores.
Triporoletes T. sp. cf. T. radiatus Base of the Marquechi Member. Spores. A bryopsid.
Tucanopollis T. sp. Base of the Marquechi Member. Pollen grains.
Undulatisporites U. undulapolus Base of the Marquechi Member. Spores.
U. sp. Base of the Marquechi Member. Spores.

See also

References

  1. ^ Javier, Grijalva Noriega, Francisco (1996). Cintura Formation--an Early Cretaceous deltaic system in northeastern Sonora, Mexico. Universidad Nacional Autónoma de México: Instituto de Geología. OCLC 814483150.{{cite book}}: CS1 maint: multiple names: authors list (link)
  2. ^ Villanueva-Amadoz, Uxue; Calvillo-Canadell, Laura; Cevallos-Ferriz, Sergio R. S.; Beraldi-Campesi, Hugo (2014). "Preliminary palaeobotanical notes on the Early Cretaceous Cintura Formation (Sonora, Mexico)". Historical Biology. 27 (3–4): 405. doi:10.1080/08912963.2014.915821. ISSN 0891-2963. S2CID 128809573.
  3. ^ Rubalcava-Knoth, Marco A.; Cevallos-Ferriz, Sergio R. S. (2022-09-01). "Lauraceous palmately lobed leaf from the middle Cretaceous Cintura Formation (Albian–Cenomanian), Sonora, Mexico: identification based on two comparative models". Cretaceous Research. 140: 105355. doi:10.1016/j.cretres.2022.105355. ISSN 0195-6671. S2CID 252028160.


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