Cintura Formation
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: | |
| 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 |
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] | |||
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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