IHN 1005, Veinte de Noviembre: Lutetian, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Nautilida - Hercoglossidae
Hercoglossa cf. ulrichi (White 1882)
Gastropoda - Heterostropha - Architectonicidae
Architectonica sp. Röding 1798
Architectonica alabamensis (Dall 1892)
Gastropoda - Heterostropha - Acteonidae
Tornatellaea bella Conrad 1860
Gastropoda - Trochidae
Trochus sp. Linnaeus 1758
Calliostoma granulata Perrilliat et al. 2006
Gastropoda - Cerithiidae
? Iddingsia sp. Olsson 1929
replaced by Iddingsella
Bittium (Bittium) estellense
originally Bittium (Bittium) estellensis, Palmer and Brann updated to Bittium (Bittium) estellense
"Cerithium" sp. Bruguière 1789
Gastropoda - Turritellidae
Palmerella mortoni (Conrad 1830)
recombined as Kapalmerella mortoni
SUBSPECIES: Palmerella mortoni mexicana
Mesalia alabamiensis (De Gregorio 1890)
? Palmerella sp. Allmon 1996
"Turritella" sp. Lamarck 1799
"Turritella" humerosa Conrad 1835
SUBSPECIES: "Turritella" humerosa sanjuanensis
Gastropoda - Potamididae
Potamides (Potamidopsis) tricarinatus (Lamarck 1804)
Gastropoda - Neotaenioglossa - Calyptraeidae
Calyptraea aperta (Solander 1766)
recombined as Calyptraea (Trochita) aperta
Gastropoda - Ampullinidae
Pachycrommium clarki (Stewart 1927)
Gastropoda - Epitoniidae
Cirsotrema sp. Mörch 1852
Gastropoda - Naticidae
Crommium globosa Perrilliat et al. 2006
Gastropoda - Neogastropoda - Melongenidae
Levifusus sp. Conrad 1865
? Cornulina sp. Conrad 1853
Gastropoda - Neogastropoda - Pseudolividae
Sulcobuccinum cf. scalina Heilprin 1880
Gastropoda - Neogastropoda - Clavatulidae
Turricula sp. Schumacher 1817
Gastropoda - Neogastropoda - Ptychatractidae
Exilia sp. Conrad 1860
Gastropoda - Neogastropoda - Volutidae
Lyrischapa spinifera Perrilliat et al. 2006
Volutilithes cf. muricinus (Lamarck 1802)
Volutocorbis minutus Perrilliat et al. 2006
Athleta petrosa (Conrad 1833)
SUBSPECIES: Athleta petrosa petrosa
Lapparia cf. nuda Stenzel and Turner 1940
Gastropoda - Seraphsidae
Terebelum (Seraphs) sp. Montfort 1810
Gastropoda - Cypraeidae
Proadusta subrostrata (Gray 1824)
Perrilliat et al. 2003 3 specimens
recombined as Eopustularia subrostrata
Proadusta subrostrata bartonensis
Proadusta acyensis (Raincourt 1876)
Perrilliat et al. 2003 1 specimen
recombined as Eopustularia acyensis
Bernaya (Bernaya) media (Deshayes 1835)
Perrilliat et al. 2003 2 specimens
Bernaya (Bernaya) media chiapasensis
Bernaya (Bernaya) obesa (Deshayes 1866)
Perrilliat et al. 2003 1 specimen
Macrocypraea veintensis n. sp. Perrilliat et al. 2003
Perrilliat et al. 2003 3 specimens
Cypraeorbis sp. Conrad 1865
Perrilliat et al. 2003 1 specimen
Cypraeorbis alabamensis (de Gregorio 1890)
Perrilliat et al. 2003 4 specimens
Cypraeorbis alabamensis ventripotens; Cypraeorbis alabamensis mexicana
Bernaya (Protocypraea) cf. angystoma (Deshayes 1835)
Perrilliat et al. 2003 1 specimen
recombined as Lyncina amygdalina
Proadusta sp. Sacco 1894
Perrilliat et al. 2003 6 specimens
Gastropoda - Eocypraeidae
Eocypraea (Eocypraea) sp. Cossmann 1903
Perrilliat et al. 2003 2 specimens
Eocypraea (Eocypraea) cf. castacensis (Stewart 1927)
Perrilliat et al. 2003 1 specimen
recombined as Grovesia castacensis
Eocypraea (Eocypraea) inflata (Lamarck 1802)
Perrilliat et al. 2003 1 specimen
recombined as Eocypraea inflata
Gastropoda - Cassidae
Galeodea koureos (Gardner 1939)
see common names

Geography
Country:Mexico State/province:Chiapas
Coordinates: 16.6° North, 92.9° West (view map)
Paleocoordinates:18.4° North, 83.6° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Paleogene Epoch:Eocene
Stage:Lutetian 10 m.y. bin:Cenozoic 2
Key time interval:Lutetian
Age range of interval:47.80000 - 41.20000 m.y. ago
Stratigraphy
Formation:San Juan
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: Assigned to the San Juan Formation in Vega et al. 2001, but reassigned to the El Bosque Formation by Perrilliat et al. (2006) on age, but not lithology. Formations are defined lithologically, not chronologically, so even if the early Eocene age is correct, it still belongs to the San Juan Formation. THICKNESS: From individual bed within section of 40 m thickness. Thickness of formation in this region is 200 m, but ranges from between 720 and 2000 m. AGE: 2). Presence of the foraminiferans Lepidocyclina (Polylepidina) antillea, Storrsella haastersi, Sigmoilopsis centralamericana, Nummulites (Paleonummulites) panamensis, and Pellatispirella matleyi suggest a middle Eocene age for the sediments of this locality. Later assigned to Ypresian on the basis of Sr isotope dating of nautilid Hercoglossa, which yields an age of ~52 Ma. The foraminiferal and lithostratigraphic context suggests the original middle Eocene age is more likely. STRATIGRAPHIC POSITION: From near top of section, within "Grit Mbr" (apparently informal) of the lower El Bosque Fm.
Lithology and environment
Primary lithology:shelly/skeletal,yellow lithified "limestone"
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Yellowish brown fine-grained calcarenite, according to Perilliat (2003). LITHIFICATION: Lithified, on the basis of figured specimens and facies description.
Environment:open shallow subtidal
Geology comments: ENVIRONMENT: "Open marine shallow shelf paleoenvironment" in Perrilliat et al. (2006). Ferrusquía-Villafranca et al. (2000) defined six lithofacies and assigned a shallow marine platform, located not far from the littoral zone.
Taphonomy
Modes of preservation:body,cast,mold/impression
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Collection method comments: COLLECTOR: Not stated, but possibly including M. C. Perilliat and colleagures. REPOSITORY: Instituto de Geologia, UNAM, Ciudad Universitaria, Mexico (IGM).
Taxonomic list comments:COVERAGE: Not exhaustive, limted to gastropoda and other taxa mentioned in text. "The diversity of marine organisms is remarkable" apparently. NOMENCLATURE: Authoritative publication with modern nomenclature and use of species and subgenus rank.
Metadata
Database number:79943
Authorizer:A. Hendy, P. Wagner Enterer:A. Hendy, P. Wagner
Modifier:M. Clapham Research group:marine invertebrate
Created:2008-03-27 14:09:46 Last modified:2022-07-19 00:46:04
Access level:the public Released:2008-03-27 14:09:46
Creative Commons license:CC BY
Reference information

Primary reference:
26864. M. D. Perrilliat, J. Avendano, F. J. Vega and J. Solé. 2006. Lower Eocene Gastropods from El Bosque Formation, Central Chiapas, Mexico. The Veliger 48(3):151-169 [A. Hendy/A. Hendy/M. Uhen]

Secondary references:

57827 M. d. C. Perrilliat, J. Avendaño, and F. J. Vega. 2003. Middle Eocene Cypraeoideans from the San Juan Formation, Chiapas, southern Mexico. Revista Mexicana de Ciecnias Geológicas 20(1):41-51 [P. Wagner/P. Wagner]