TU 638 - 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 Unpublished notes [A. Hendy/A. Hendy/P. Wagner]more details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 92449: authorized by Austin Hendy, entered by Austin Hendy on 13.11.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to Trajana (Nassariidae) described in text, and subsequent publications. NOMENCLATURE: Authoritative publication with modern nomenclature and species-resolution identifications.
 Pectinida - Pectinoidae
Nodipecten collierensis11 scallop
SUBSPECIES: Nodipecten collierensis floridensis
 Neogastropoda - Nassariidae
Trajana (Trajana) veracruzana n. sp.4 Vokes 1969 snail
 Neogastropoda - Turbinellidae
Turbinella hermani n. sp.9 Vokes 1984 snail
 Neogastropoda - Muricidae
Typhis (Talityphis) carmenae n. sp.2 Gertman 1969 murex snail
Attiliosa striata8 Gabb 1873 murex snail
"Murexiella (Murexiella) macgintyi" = Murexiella macgintyi3 Smith 1938 murex snail
SUBSPECIES: Murexiella (Murexiella) macgintyi faceta
Murexiella (Murexiella) veracruzana n. sp.3 Vokes 1968 murex snail
Hexaplex (Murexsul) thalmanni n. sp.3 Vokes 1968 murex snail
Chicoreus (Chicoreus) dilectus6 Adams 1854 murex snail
Poirieria (Panamurex) alaquaensis5 Mansfield 1935 murex snail
 Neogastropoda - Harpidae
Harpa isthmica10 Vokes 1984 snail
 Vanikoroidea - Hipponicidae
Cheilea equestris7 Linnaeus 1758 hoof shell
 Tonnoidea - Ranellidae
Monoplex parthenopeus1 von Salis Marschlins 1793 triton shell
 Tonnoidea - Personidae
Distorsio clathrata1 Lamarck 1816 snail
 Tonnoidea - Bursidae
Bursa corrugata1 Perry 1811 frog shell