TU 1046 - Coatzacoalcos [Agueguexquite Fm] (Pliocene of Mexico)

Where: Veracruz, Mexico (18.2° N, 94.4° W: paleocoordinates 18.2° N, 93.8° W)

• coordinate based on nearby landmark

• local area-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. From other sources: 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: Late Pliocene; 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.

• formation-level stratigraphic resolution

Environment/lithology: coastal; unlithified, micaceous, shelly/skeletal, gray, blue, carbonaceous claystone

• No geologic or paleoenvironmental data reported in text.
• SPECIFIC LITHOLOGY: The sediments consist principally of bluish grey sandy clays, mostly micaceous, with intercalations of grit and sand, poorly bedded, containing a rich fauna of gastropoda and lamellibrancha, and scatterd plant remains. The very base of the unit has layers of quartz pebbles, from hazelnut to walnut in size. LITHIFICATION: No lithification data is reported, however all figured specimens show no evidence of lithified matrix and therefore this collection is assigned as unlithified.

Size class: macrofossils

Preservation: original aragonite

Collected by Vokes & Vokes; reposited in the USNM

Collection methods: surface (in situ),

• COLLECTOR: E. Vokes and H. Vokes. REPOSITORY: Florida Museum of Natural History.

Primary reference: E. H. Vokes and H. E. Vokes. 2000. Catalogue of Tulane University fossil localities. Unpublished notes [A. Hendy/A. Hendy/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 92779: authorized by Austin Hendy, entered by Austin Hendy on 28.11.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to taxa described in text, and subsequent publications. NOMENCLATURE: Authoritative publication with modern nomenclature and species-resolution identifications.
Gastropoda
 Sorbeoconcha - Ranellidae
Monoplex aquatilis1 Reeve 1844 triton shell
 Sorbeoconcha - Bursidae
Bursa rugosa1 Sowerby 1835 frog shell
Bursa corrugata1 Perry 1811 frog shell
 Sorbeoconcha - Personidae
Distorsio mcgintyi1 Emerson and Puffer 1953 snail
Distorsio clathrata1 Lamarck 1816 snail
 Neogastropoda - Harpidae
Harpa isthmica n. sp.5 Vokes 1984 snail
 Neogastropoda - Muricidae
Chicoreus (Chicoreus) dilectus3 Adams 1854 murex snail
 Neogastropoda - Olividae
Oliva (Omogymna) liodes2 Dall 1903 olive snail
 Neogastropoda - Turbinellidae
Turbinella hermani4 Vokes 1984 snail