IGM Loc. 3679 - El Tepache [Agueguexquite Fm] (Pliocene of Mexico)

Where: Veracruz, Mexico (18.1° N, 94.4° W: paleocoordinates 18.2° N, 93.9° 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 Pliocene. Assigned here, provisionally, to the late Pliocene age (following 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.

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; unlithified siliciclastic sediments

• SPECIFIC LITHOLOGY: Assumed to be siliciclastic based on other collections. LITHIFICATION: Assumed unlithified, on the basis of preservation of figured specimens.

Size classes: macrofossils, mesofossils

Collection methods: bulk, surface (in situ), sieve,

• COLLECTOR: Not stated. REPOSITORY: IGM, Mexico.

Primary reference: M. C. Perrilliat and P. Flores-Guerrero. 2011. Moluscos de la Formación Agueguexquite (Plioceno inferior) de Coatzacoalcos, Veracruz, México. Revista Mexicana de Ciencias Geológicas 28(3):379-397 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 134767: authorized by Austin Hendy, entered by Austin Hendy on 16.10.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for molluscs. NOMENCLATURE: Authoritative publication, with modern nomenclature, and consistent use of subgenera and species-level assignments.
Gastropoda
 Vanikoroidea - Eulimidae
 Pseudomelanoidea - Pseudomelaniidae
Carinodrillia cf. pylonia Fargo 1953 snail
 Neogastropoda - Columbellidae
Mitrella debooyi Maury 1917 snail
 Neogastropoda - Conidae
Conus almagrensis Böse 1910 cone shell
 Neogastropoda - Drilliidae
 Neogastropoda - Borsoniidae
 Neogastropoda - Clathurellidae
Nannodiella rintriada Mansfield 1925 snail
 Neogastropoda - Mangeliidae
 Neogastropoda - Terebridae
Terebra (Oreoterebra) subsulcifera Brown and Pilsbry 1911 auger snail
 Neogastropoda - Costellariidae
Uromitra vokesae ribbed mitre
 Neogastropoda - Cystiscidae
Persicula (Gibberula) glandula Weisbord 1962 snail
 Sorbeoconcha - Naticidae
Polinices sp. Monfort 1810 moon snail
 Sorbeoconcha - Rissoidae
Rissoa cf. epulata Pilsbry and Johnson 1917 snail
Schwartziella catesbyana d'Orbigny 1842 snail
 Sorbeoconcha - Cerithiopsidae
"Bittium alternatum" = Cerithiopsis alternata
"Bittium alternatum" = Cerithiopsis alternata Gabb 1864 snail
 Sorbeoconcha - Vitrinellidae
 Heterostropha - Pyramidellidae
"Turbonilla (Chemnitzia) atlasi" = Chemnitzia snail
 Heterostropha - Architectonicidae
Architectonica (Pseudotorinia) cf. nupera, "Architectonica (Architectonica) nobilis" = Architectonica nobilis
"Architectonica (Architectonica) nobilis" = Architectonica nobilis Röding 1798 sundial
 Opisthobranchia - Haminoeidae
Atys sp. Montfort 1810 snail
 Opisthobranchia - Cylichnidae
Acteocina rusa barrel-bubble
Acteocina lepta Woodring 1928 barrel-bubble
 Opisthobranchia - Retusidae
Sulcoretusa sulcata d'Orbigny 1841 snail
Bivalvia
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Mytilida - Crenellidae
 Pholadida - Corbulidae
 Cardiida - Vesicomyidae
 Cardiida - Veneridae
"Gouldia insulare" = Gouldia insularis Dall and Simpson 1901 venus clam
Lirophora (Lirophora) latilirata Conrad 1841 venus clam
 Cardiida - Cardiidae
Americardia media Linnaeaus 1758 cockle
 Cardiida - Tellinidae
Scaphopoda
 Gadilida - Gadilidae
Cadulus sp. Philippi 1844 tusk shell
 Dentaliida - Dentaliidae