Cuenca Salina del Istmo del Tehuantepec [Agueguexquite Fm]: Late Pliocene, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Heterostropha - Architectonicidae
Gastropoda - Naticidae
Gastropoda - Personidae
Personella floridana (Olsson and McGinty 1951)
    = Distorsio clathrata Lamarck 1816
Landau and Marques da Silva 2010
Gastropoda - Neogastropoda - Mitridae
Gastropoda - Neogastropoda - Fasciolariidae
Gastropoda - Neogastropoda - Cochlespiridae
Gastropoda - Neogastropoda - Turridae
Polystira barretti (Guppy 1866)
Scobinella morierei (Cossmann 1913)
Gastropoda - Neogastropoda - Pseudomelatomidae
Gastropoda - Neogastropoda - Terebridae
Gastropoda - Neogastropoda - Conidae
    = Conus multiliratus Olsson 1922
Hoerle 1976
Gastropoda - Neogastropoda - Harpidae
Harpa americana Pilsbry 1922
Vokes 1984
Gastropoda - Neogastropoda - Muricidae
Gastropoda - Neogastropoda - Olividae
Woodring 1964
Gastropoda - Trochidae
Bivalvia - Arcida - Arcidae
Bivalvia - Pectinida - Pectinidae
Amusium (Amusium) sp. (Röding 1798)
Bivalvia - Cardiida - Cardiidae
see common names

Geography
Country:Mexico State/province:Veracruz
Coordinates: 18.1° North, 94.3° West (view map)
Paleocoordinates:18.7° North, 93.4° West (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Neogene Epoch: Pliocene
Stage: Piacenzian 10 m.y. bin: Cenozoic 6
Key time interval: Late Pliocene
Age range of interval: 3.6 - 2.58 m.y. ago
Stratigraphy
Formation:Agueguexquite
Stratigraphic resolution:bed
Stratigraphy comments: 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.
Lithology and environment
Primary lithology:micaceous,shelly/skeletal,gray,blue unlithified sandy,carbonaceous claystone
Includes fossils?Y
Lithology description: 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. No lithification data is reported, however all figured specimens show now evidence of lithified matrix and therefore this collection is assigned as unlithified.
Environment:coastal indet.
Glacial or sequence phase:transgressive
Geology comments: Accumulated during a marine transgression as evidence by basal pebble lag. Deposited in shallow warm water within the neritic zone.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:59420
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2006-04-02 14:57:28 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2008-04-02 14:57:28
Creative Commons license:CC0
Reference information

Primary reference:
17059. M.C. Perrilliat. 1960. Moluscos del Mioceno de la Cuenca Salina del Istmo de Tehuantepec, Mexico. Paleontologia Mexicana 8:1-31 [A. Miller/A. Hendy/A. Hendy]

Secondary references:

31308 S. E. Hoerle. 1976. The genus Conus (Mollusca: Gastropoda) from the Alum Bluff Group of northwestern Florida. Tulane Studies in Geology and Paleontology 12(1):1-31 [A. Hendy/A. Hendy]
36423 B. Landau and C. Marques da Silva. 2010. Early Pliocene gastropods of Cubagua, Venezuela: Taxonomy, palaeobiogeography and ecostratigraphy. Palaeontos 19:1-221 [A. Hendy/A. Hendy]
31294 E. H. Vokes. 1984. The genus Harpa (Mollusca: Gastropoda) in the new world. Tulane Studies in Geology and Paleontology 18(1-2):53-60 [A. Hendy/A. Hendy]
13232 W. P. Woodring. 1964. Geology and paleontology of canal zone and adjoing parts of Panama: Description of Tertiary mollusks (gastropods: Columbellidae to Volutidae). United States Geological Survey Professional Paper 306(C):241-297 [A. Miller/A. Hendy/A. Hendy]