Where: Mexico (17.6° N, 95.1° W: paleocoordinates 17.7° N, 94.5° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Agueguexquite Formation, Late/Upper Pliocene (3.6 - 2.6 Ma)
• STRATIGRAPHIC RELATIONS: From the Agueguexquite Formation, for which lithostratigraphic relationships are not stated in english. Overlies the Upper Conception and Filisola Fms (Early-Late Pliocene) according to Collins and Coates (1999, p. 75), and is equivalent to the Tirabuzon Fm of Mexico's Maria Madre Island, and Esmeraldas of NW Ecuador. AGE: Stated to be Middle Miocene. Assigned here, provisionally, to a Pliocene age (see following, from PBDB# 59420: The geological age according to Perilliat (1960) is upper Lower Miocene or lower Middle Miocene (Helvetian or Tortonian). The fauna is apparently closely connected with that from the Choctawhatchee Fm in Florida....The Agueguexquite Fm represents the youngest Miocene deposition as yet found in the Coatzacoalcos Basin and can approximately can be correlated with the Mid-upper Gatun Fm in Panama or with basal Bowden Fm of Jamaica (Thalmann 1935). More recent descriptions of fauna from the Agueguexquite Fm assign it to the Pliocene, more specifically the middle Pliocene (N20). This also matches revised ages for the Bowden Fm, although the Gatun spans the Late Miocene and Early Pliocene. Late Pliocene according to Collins and Coates (1999, p. 75). STRATIGRAPHIC POSITION: From unknown position in formation.
• bed-level stratigraphic resolution
Environment/lithology: coastal; unlithified, micaceous, shelly/skeletal, gray, blue, sandy, carbonaceous claystone
Size class: macrofossils
Collected by Wade in 1920; reposited in the USNM
Collection methods: surface (in situ),
• COLLECTOR: B. Wade (John Hopkins University), 1920. REPOSITORY: IGM, Mexico, and USNM.
Primary reference: M. C. Perrilliat. 1972. Monografia de los Moluscos del Mioceno Medio de Santa Rosa, Verazruz, Mexico. Paleontologia Mexicana 32:1-130 [A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 77713: authorized by Austin Hendy, entered by Austin Hendy on 17.01.2008
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Fissurella (Fissurella) mexicana Perrilliat 1972 snail | |
Turritella subgrundifera Dall 1892 turret shell | |
Rissoa epulata Pilsbry and Johnson 1917 snail
Crepitacella cepula Guppy 1866 snail | |
Caecum anellifer Pilsbry and Johnson 1917 snail
Caecum mexicanum Collins 1937 snail
Caecum veracruzanum Collins 1937 snail
Meioceras constrictum Gabb 1873 snail | |
Vitrinella obliquestriata, Cyclostremiscus (Ponocyclus) pentagonus, Cyclostremiscus (Ponocyclus) domingensis
Vitrinella obliquestriata Gabb 1881 snail
Cyclostremiscus (Ponocyclus) pentagonus Gabb 1873 snail
Cyclostremiscus (Ponocyclus) domingensis Pilsbry and Johnson 1917 snail | |
"Architectonica (Architectonica) nobilis" = Architectonica nobilis
"Architectonica (Architectonica) nobilis" = Architectonica nobilis Röding 1798 sundial | |
Smaragdia (Smaragdia) viridis Linnaeus 1758 snail SUBSPECIES: Smaragdia (Smaragdia) viridis viridemaris
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