| 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 |
The Cintura Formation is a geologic formation in the northeastern Sonora of Arizona and Mexico. [2] It preserves fossils dating back to the Cretaceous period.
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. [2] The delta is thought to have prograded southward and have an immediate source to its north based on paleocurrents and provenance data. [2]
| Dinoflagellates | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Oligosphaeridium | O. sp. | Base of the Marquechi Member. [3] | Dinoflagellate cysts. [3] | ||
| Plants | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| cf. Acanthotriletes | cf. A. varispinosus | Base of the Marquechi Member. [3] | Spores. [3] | ||
| Alisporites | A. sp. | Base of the Marquechi Member. [3] | Pollen grains. [3] | ||
| Araliaephyllum | A. silvapinedae | Near the town of Cabullona, Sonora, Mexico. [4] | A trilobed leaf. [4] | A laurale. | |
| Baculatisporites | B. sp. | Base of the Marquechi Member. [3] | Spores. [3] | ||
| Cicatricosisporites | C. hallei | Base of the Marquechi Member. [3] | Spores. [3] | A schizaeacean fern. | |
| C. sp. | Base of the Marquechi Member. [3] | Spores. [3] | A schizaeacean fern. | ||
| Classopollis | C. spp. | Base of the Marquechi Member. [3] | Pollen grains. [3] | A cheirolepidiaceaen conifer. | |
| Clavatipollenites | C. tenellis | Base of the Marquechi Member. [3] | Pollen grains. [3] | ||
| Cycadopites | C. sp. | Base of the Marquechi Member. [3] | Pollen grains. [3] | ||
| Deltoidospora | D. sp. | Base of the Marquechi Member. [3] | Spores. [3] | ||
| Ephedripites | E. sp. | Base of the Marquechi Member. [3] | Pollen grains. [3] | ||
| Exesipollenites | E. tumulus | Base of the Marquechi Member. [3] | Pollen grains. [3] | ||
| Inaperturopollenites | I. sp. | Base of the Marquechi Member. [3] | Pollen grains. [3] | A conifer. | |
| Isoetites | I. sp. | San Juan Member. [3] | Leaves. [3] | An isoetalean. | |
| Leptolepidites | L. sp. 1 | Base of the Marquechi Member. [3] | Spores. [3] | A fern. | |
| L. sp. 2 | Base of the Marquechi Member. [3] | Spores. [3] | A fern. | ||
| L. sp. 3 | Base of the Marquechi Member. [3] | Spores. [3] | A fern. | ||
| Osmundacites | O. wellmanii | Base of the Marquechi Member. [3] | Spores. [3] | ||
| Ovoidites | O. parvus | Base of the Marquechi Member. [3] | Spores. [3] | An aquatic zygnematale. | |
| Patellasporites | P. sp. | Base of the Marquechi Member. [3] | Spores. [3] | ||
| Perinopollenites | P. sp. | Base of the Marquechi Member. [3] | Pollen grains. [3] | ||
| Peromonolites | P. allensis | Base of the Marquechi Member. [3] | Spores. [3] | A fern. | |
| Pityosporites | P. sp. | Base of the Marquechi Member. [3] | Pollen grains. [3] | ||
| Plicatella | P. potomacensis | Base of the Marquechi Member. [3] | Spores. [3] | ||
| Raistrickia | R. sp. | Base of the Marquechi Member. [3] | Spores. [3] | ||
| Retimonocopites | R. sp. 1 | Base of the Marquechi Member. [3] | Pollen grains. [3] | ||
| R. sp. 2 | Base of the Marquechi Member. [3] | Pollen grains. [3] | |||
| Spheripollenites | S. sp. | Base of the Marquechi Member. [3] | Pollen grains. [3] | ||
| Taxodiaceaepollenites | T. hiatus | Base of the Marquechi Member. [3] | Pollen grains. [3] | ||
| Todisporites | T. minor | Base of the Marquechi Member. [3] | Spores. [3] | ||
| Triporoletes | T. sp. cf. T. radiatus | Base of the Marquechi Member. [3] | Spores. [3] | A bryopsid. | |
| Tucanopollis | T. sp. | Base of the Marquechi Member. [3] | Pollen grains. [3] | ||
| Undulatisporites | U. undulapolus | Base of the Marquechi Member. [3] | Spores. [3] | ||
| U. sp. | Base of the Marquechi Member. [3] | Spores. [3] | |||
The La Boca Formation is a geological formation in Tamaulipas state, northeast Mexico. It was thought to date back to the Early Jurassic, concretely the Pliensbachian stage epoch. Although, the latest studies had proven that the local Vulcanism, related to the aperture of the Atlantic Ocean and the several Rift Events, that continue until the Bajocian, while the unit itself was likely deposited between the earliest Pliensbachian, as proven by zircon with the fossil taxa deposited on the rocks above, likely of Late Pliensbachian-Lower Toarcian age, and the upper section of Late Toarcian-Late Aalenian age. Due to successions of Aalenian depositional sistems on the upper layers of the Huizachal Canyon, has been delimited the formation to the Toarcian stage, being the regional equivalent of the Moroccan Azilal Formation. In North America, La Boca Formation was found to be a regional equivalent of the Eagle Mills redbeds of southern United States, the Todos Santos Formation of southern Mexico and the Barracas Group of the Sonora desert region.
The El Gallo Formation is a geological formation in Mexico whose strata date back to the Late Cretaceous, Campanian epoch, specifically dated to 75.21 ± 0.07 Ma and 74.55 ± 0.09 Ma. Dinosaur remains are among the fossils that have been recovered from the formation.
The Cerro del Pueblo Formation is a geological formation in Coahuila, Mexico whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation. The formation is believed to correlate with the Baculites reesidesi and Baculites jenseni ammonite zones, which dates it to 73.63-72.74 Ma.
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The Itaboraian age is a period within the Early Eocene geologic time epoch of the Paleogene, used more specifically with South American land mammal ages (SALMA). It follows the Riochican and precedes the Casamayoran age.
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