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 |
Location | |
Region | Arizona and Sonora |
Country | ![]() ![]() |
Type section | |
Named by | Ransome |
Year defined | 1904 |
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
- ^ 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) - ^ 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.
- ^ 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.
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