Agueguexquite Formation (unspecified localities) (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

Reposited in the USNM

Collection methods: surface (in situ),

• COLLECTOR: Unknown. REPOSITORY: Unknown.

Primary reference: W. P. Woodring. 1973. Geology and paleontology of canal zone and adjoing parts of Panama: Description of Tertiary mollusks (additions to gastropods, scaphopods, pelecypods: Nuculidae to Malleidae). United States Geological Survey Professional Paper 306(E):453-539 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 96440: authorized by Austin Hendy, entered by Austin Hendy on 08.06.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to to taxa miscellaneously mentioned in text. NOMENCLATURE: Authoritative publication with modern nomenclature and species-resolution identifications.
 Arcida - Arcidae
Acar domingensis Lamarck 1819 miniature ark
 Neogastropoda - Columbellidae
Strombina (Lirastrombina) olssoni2 Perrilliat 1972 snail
 Neogastropoda - Nassariidae
Gordanops baranoanus3 Anderson 1929 snail
 Neogastropoda - Cancellariidae
Admetula zapoteca4 Böse 1910 snail
Sveltia zahni4 Böse 1910 snail
 Neogastropoda - Muricidae
Typhis (Typhinellus) sowerbii5 Broderip 1833 murex snail
Chicoreus (Phyllonotus) pomum5 Gmelin 1791 murex snail
 Neogastropoda - Harpidae
Morum (Morum) oniscus5 Linnaeaus 1767 snail
 Neogastropoda - Conidae
Conus imitator3 Brown and Pilsbry 1911 cone shell
 Neogastropoda - Terebridae
Terebra (Oreoterebra) isaacpetiti6 Maury 1925 auger snail
 Ficoidea - Ficidae
Ficus carbasea1 Guppy 1866 fig shell
 Tonnoidea - Ranellidae
Monoplex aquatilis1 Reeve 1844 triton shell
Monoplex parthenopeus1 von Salis Marschlins 1793 triton shell
 Tonnoidea - Personidae
Distorsio clathrata1 Lamarck 1816 snail
Distorsio constricta1 Broderip 1835 snail
 Tonnoidea - Bursidae
Bursa corrguata1 frog shell
Bursa rugosa1 Sowerby 1835 frog shell
 Sorbeoconcha - Turritellidae
Vermicularia cf. woodringi3 Olsson and Harbison 1953 turret shell