The Cintura Formation is a geologic formation in the northeastern Sonora of Arizona and Mexico.[1] It preserves fossils dating back to the Cretaceous period.

Cintura Formation
Stratigraphic range: Albian–Cenomanian
TypeGeological formation
Unit ofBisbee Group
Sub-unitsMarquechi, San Marcos and San Juan Member
Thickness1,146 meters[1]
Location
RegionArizona and Sonora
Country United States,  Mexico
Type section
Named byRansome
Year defined1904

Description

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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.[1] The delta is thought to have prograded southward and have an immediate source to its north based on paleocurrents and provenance data.[1]

Fossil content

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

See also

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References

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  1. ^ a b c d 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. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc bd be bf bg bh bi bj bk bl bm bn bo bp 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. ^ a b 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.