Cintura Formation

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

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.

Contents

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
GenusSpeciesPresenceMaterialNotesImages
Oligosphaeridium O. sp.Base of the Marquechi Member. [2] Dinoflagellate cysts. [2]
Plants
GenusSpeciesPresenceMaterialNotesImages
cf. Acanthotriletes cf. A. varispinosusBase of the Marquechi Member. [2] Spores. [2]
Alisporites A. sp.Base of the Marquechi Member. [2] Pollen grains. [2]
Araliaephyllum A. silvapinedaeNear 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. halleiBase 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. tenellisBase 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. tumulusBase 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. 1Base of the Marquechi Member. [2] Spores. [2] A fern.
L. sp. 2Base of the Marquechi Member. [2] Spores. [2] A fern.
L. sp. 3Base of the Marquechi Member. [2] Spores. [2] A fern.
Osmundacites O. wellmaniiBase of the Marquechi Member. [2] Spores. [2]
Ovoidites O. parvusBase 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. allensisBase of the Marquechi Member. [2] Spores. [2] A fern.
Pityosporites P. sp.Base of the Marquechi Member. [2] Pollen grains. [2]
Plicatella P. potomacensisBase of the Marquechi Member. [2] Spores. [2]
Raistrickia R. sp.Base of the Marquechi Member. [2] Spores. [2]
Retimonocopites R. sp. 1Base of the Marquechi Member. [2] Pollen grains. [2]
R. sp. 2Base of the Marquechi Member. [2] Pollen grains. [2]
Spheripollenites S. sp.Base of the Marquechi Member. [2] Pollen grains. [2]
Taxodiaceaepollenites T. hiatusBase of the Marquechi Member. [2] Pollen grains. [2]
Todisporites T. minorBase of the Marquechi Member. [2] Spores. [2]
Triporoletes T. sp. cf. T. radiatusBase of the Marquechi Member. [2] Spores. [2] A bryopsid.
Tucanopollis T. sp.Base of the Marquechi Member. [2] Pollen grains. [2]
Undulatisporites U. undulapolusBase of the Marquechi Member. [2] Spores. [2]
U. sp.Base of the Marquechi Member. [2] Spores. [2]

See also

References

  1. 1 2 3 4 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) CS1 maint: publisher location (link)
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 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. 1 2 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.