Cuenca Salina del Istmo del Tehuantepec [Agueguexquite Fm] (Pliocene of Mexico)

Where: Veracruz, Mexico (18.1° N, 94.3° W: paleocoordinates 18.2° N, 93.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Agueguexquite Formation, Late/Upper Pliocene (3.6 - 2.6 Ma)

• 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.

• bed-level stratigraphic resolution

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

• Accumulated during a marine transgression as evidence by basal pebble lag. Deposited in shallow warm water within the neritic zone.
• 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.

Size class: macrofossils

Primary reference: 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 59420: authorized by Austin Hendy, entered by Austin Hendy on 02.04.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Arcida - Arcidae
Anadara (Anadara) arata, Anadara (Anadara) woodringi, "Anadara (Anadara) istmica" = Anadara (Rasia) actinophora, "Anadara (Anadara) lienosa" = Anadara (Rasia) lienosa
Anadara (Anadara) woodringi Perrilliat 1960 ark
"Anadara (Anadara) istmica" = Anadara (Rasia) actinophora Dall 1898 ark
"Anadara (Anadara) lienosa" = Anadara (Rasia) lienosa Say 1832 ark
 Pectinida - Pectinoidae
"Pecten (Euvola) bowdenensis" = Euvola bowdenensis, Amusium (Amusium) sp.
"Pecten (Euvola) bowdenensis" = Euvola bowdenensis Dall 1898 scallop
Amusium (Amusium) sp. Röding 1798 scallop
 Cardiida - Cardiidae
"Trigoniocardia (Americardia) media" = Americardia media
"Trigoniocardia (Americardia) media" = Americardia media Linnaeaus 1758 cockle
Gastropoda
 Neogastropoda - Olividae
"Oliva (Oliva) cristobalcoloni" = Oliva cristobalcoloni4
"Oliva (Oliva) cristobalcoloni" = Oliva cristobalcoloni4 Maury 1917 olive snail
 Neogastropoda - Fasciolariidae
Fasciolaria semistriata Sowerby 1850 tulip snail
 Neogastropoda - Mitridae
"Mitra (Tiara) rhadina" = Subcancilla rhadina
"Mitra (Tiara) rhadina" = Subcancilla rhadina Woodring 1928 mitre shell
 Neogastropoda - Muricidae
"Murex (Murex) recurvirostris" = Vokesimurex recurvirostris
"Murex (Murex) recurvirostris" = Vokesimurex recurvirostris Broderip 1832 murex snail
 Neogastropoda - Harpidae
Harpa isthmica3 Vokes 1984 snail
 Neogastropoda - Cochlespiridae
"Ancistrosyrinx miranda" = Cochlespira (Ancistrosyrinx) miranda
"Ancistrosyrinx miranda" = Cochlespira (Ancistrosyrinx) miranda Guppy 1882 snail
 Neogastropoda - Drilliidae
Crassispira alesidota Dall 1889 snail
Subspecies: Crassispira alesidota magna
 Neogastropoda - Turridae
Scobinella morierei Cossmann 1913 turrid
Polystira barretti Guppy 1866 turrid
 Neogastropoda - Conidae
"Conus multiliratus" = Conasprelloides multiliratus1, "Conus (Leptoconus) burckhardti" = Conus burckhardti, "Conus (Leptoconus) consobrinus" = Conus consobrinus
"Conus multiliratus" = Conasprelloides multiliratus1 Olsson 1922 cone shell
"Conus (Leptoconus) burckhardti" = Conus burckhardti Bose 1906 cone shell
"Conus (Leptoconus) consobrinus" = Conus consobrinus Sowerby 1850 cone shell
 Neogastropoda - Terebridae
"Terebra (Paraterebra) isaacpetiti" = Terebra (Oreoterebra) isaacpetiti
"Terebra (Paraterebra) isaacpetiti" = Terebra (Oreoterebra) isaacpetiti Maury 1925 auger snail
 Naticoidea - Naticidae
"Natica (Naticarius) canrena" = Naticarius canrena
"Natica (Naticarius) canrena" = Naticarius canrena Linnaeus 1758 moon snail
Subspecies: N. (Naticarius) canrena antinacca
 Tonnoidea - Personidae
Distorsio clathrata2 Lamarck 1816 snail
 Architectonicoidea - Architectonicidae
"Architectonica (Architectonica) nobilis" = Architectonica nobilis
"Architectonica (Architectonica) nobilis" = Architectonica nobilis Röding 1798 sundial
Subspecies: A. (A.) nobilis quadriseriata
 Trochoidea - Trochidae