Loc. 23737 [Agueguexquite Fm]: Late/Upper Pliocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda
- Neritidae
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Smaragdia (Smaragdia) viridis
(Linnaeus 1758)
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SUBSPECIES: Smaragdia (Smaragdia) viridis viridemaris | ||||||||||
Neritina (Neritina) woodwardi
(Guppy 1866)
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Gastropoda
- Turritellidae
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Turritella sp.
Lamarck 1799
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Turritella abrupta
(Spieker 1922)
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Turritella tuxtepecensis
Bose 1906
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Vermicularia spirata
(Philippi 1836)
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Gastropoda
- Caecidae
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Meioceras constrictum
(Gabb 1873)
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Caecum tomaculum
(Weisbord 1962)
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Caecum chipolanum
Gardner 1947
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Caecum veracruzanum
Collins 1937
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Caecum anellifer
Pilsbry and Johnson 1917
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Caecum mexicanum
Collins 1937
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Gastropoda
- Tornidae
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Teinostoma (Pseudorotella) stemonium
Woodring 1957
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Teinostoma (Idioraphe) chipolanum
(Dall 1892)
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Gastropoda
- Vitrinellidae
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Vitrinella obliquestriata
Gabb 1881
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Cyclostremiscus (Ponocyclus) pentagonus
(Gabb 1873)
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Cyclostremiscus (Ponocyclus) guppyi
(Mansfield 1925)
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Gastropoda
- Rissoidae
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Crepitacella cepula
(Guppy 1866)
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Rissoa epulata
Pilsbry and Johnson 1917
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Gastropoda
- Lepetellida
- Fissurellidae
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Hemitoma sp.
Swainson 1840
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Diodora cf. cayenensis
(Lamarck 1822)
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SUBSPECIES: Diodora cf. cayenensis henekeni | ||||||||||
Fissurella (Fissurella) mexicana
Perrilliat 1972
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Gastropoda
- Skeneidae
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Solariorbis boardmani
Perrilliat 1972
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Gastropoda
- Liotiidae
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Liotia woodringi
Perrilliat 1972
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? Didianema sp.
Woodring 1928
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Gastropoda
- Trochidae
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Microgaza (Microgaza) santarosaensis
Perrilliat 1972
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Calliostoma (Calliostoma) pulcher
(Adams 1850)
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SUBSPECIES: Calliostoma (Calliostoma) pulcher mexicana | ||||||||||
Gastropoda
- Heterostropha
- Architectonicidae
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Architectonica (Pseudotorinia) euprepes
Woodring 1928
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Architectonica (Architectonica) nobilis
(Röding 1798)
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original and current combination Architectonica nobilis | ||||||||||
see common names |
Geography
Country: | Mexico |
Coordinates: | 17.6° North, 95.1° West (view map) |
Paleocoordinates: | 17.7° North, 94.5° West |
Basis of coordinate: | stated in text |
Geographic resolution: | outcrop |
Time
Period: | Neogene | Epoch: | Pliocene |
Stage: | Piacenzian | 10 m.y. bin: | Cenozoic 6 |
Key time interval: | Late/Upper Pliocene | ||
Age range of interval: | 3.60000 - 2.58000 m.y. ago |
Stratigraphy
Formation: | Agueguexquite | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: 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 Middle Miocene. Assigned here, provisionally, to a Pliocene age (see following, from 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. |
Lithology and environment
Primary lithology: | micaceous,shelly/skeletal,gray,blue unlithified sandy,carbonaceous claystone |
Includes fossils? | Y |
Lithology description: 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. | |
Environment: | coastal indet. |
Glacial or sequence phase: | transgressive |
Geology comments: SEQUENCE STRATIGRAPHY: Accumulated during a marine transgression as evidence by basal pebble lag. ENVIRONMENT: Deposited in shallow warm water within the neritic zone.
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Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | surface (in situ),field collection |
Reason for describing collection: | taxonomic analysis |
Museum repositories: | USNM |
Collection method comments: COLLECTOR: Not stated, but during John Hopkins University and USNM expedition, 1965. REPOSITORY: IGM, Mexico, and USNM. | |
Taxonomic list comments:COVERAGE: Exhaustive for gastropoda. NOMENCLATURE: Authoritative publication, with fairly modern nomenclature, and consistent use of subgenera and species-level assignments. |
Metadata
Database number: | 77714 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Created: | 2008-01-17 09:05:00 | Last modified: | 2013-11-25 13:37:23 |
Access level: | authorizer only | Released: | 2010-01-17 09:05:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
26246. | M. C. Perrilliat. 1972. Monografia de los Moluscos del Mioceno Medio de Santa Rosa, Verazruz, Mexico. Paleontologia Mexicana 32:1-130 [A. Hendy/A. Hendy/J. Alroy] |