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
Reposited in the USNM
Collection methods: surface (in situ),
• COLLECTOR: Not stated, but during John Hopkins University and USNM expedition, 1965. 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 77714: authorized by Austin Hendy, entered by Austin Hendy on 17.01.2008
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
? Didianema sp. Woodring 1928 snail
Liotia woodringi Perrilliat 1972 snail | |
Solariorbis boardmani Perrilliat 1972 snail | |
Microgaza (Microgaza) santarosaensis Perrilliat 1972 top snail
Calliostoma (Calliostoma) pulcher Adams 1850 top snail SUBSPECIES: Calliostoma (Calliostoma) pulcher mexicana
| |
Hemitoma sp. Swainson 1840 snail
Fissurella (Fissurella) mexicana Perrilliat 1972 snail | |
Vermicularia spirata Philippi 1836 turret shell
Turritella sp. Lamarck 1799 turret shell
Turritella abrupta Spieker 1922 turret shell
Turritella tuxtepecensis Bose 1906 turret shell | |
Rissoa epulata Pilsbry and Johnson 1917 snail
Crepitacella cepula Guppy 1866 snail | |
Teinostoma (Idioraphe) chipolanum Dall 1892 snail
Teinostoma (Pseudorotella) stemonium Woodring 1957 snail | |
Caecum anellifer, Caecum mexicanum, Caecum chipolanum, Caecum tomaculum, Caecum veracruzanum, Meioceras constrictum
Caecum anellifer Pilsbry and Johnson 1917 snail
Caecum mexicanum Collins 1937 snail
Caecum chipolanum Gardner 1947 snail
Caecum tomaculum Weisbord 1962 snail
Caecum veracruzanum Collins 1937 snail
Meioceras constrictum Gabb 1873 snail | |
Vitrinella obliquestriata, Cyclostremiscus (Ponocyclus) pentagonus, Cyclostremiscus (Ponocyclus) guppyi
Vitrinella obliquestriata Gabb 1881 snail
Cyclostremiscus (Ponocyclus) pentagonus Gabb 1873 snail
Cyclostremiscus (Ponocyclus) guppyi Mansfield 1925 snail | |
Architectonica (Pseudotorinia) euprepes, "Architectonica (Architectonica) nobilis" = Architectonica nobilis
Architectonica (Pseudotorinia) euprepes Woodring 1928 snail
"Architectonica (Architectonica) nobilis" = Architectonica nobilis Röding 1798 sundial | |
Smaragdia (Smaragdia) viridis Linnaeus 1758 snail SUBSPECIES: Smaragdia (Smaragdia) viridis viridemaris
Neritina (Neritina) woodwardi Guppy 1866 snail |