Cintura Formation

Cintura Formation
Stratigraphic range: Albian–Cenomanian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Bisbee Group
Sub-units	Marquechi, San Marcos and San Juan Member
Thickness	1,146 meters [1]
Location
Region	Arizona and Sonora
Country	United States, Mexico
Type section
Named by	Ransome
Year defined	1904

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.

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. ^[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

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

• Earth sciences portal
• Arizona portal
• Paleontology portal

• List of fossiliferous stratigraphic units in Arizona
• Paleontology in Arizona

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.
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.

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database" . Retrieved 17 December 2021.