IGM 2940, N. of Temalac: Late/Upper Maastrichtian, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Hedbergellidae
Hedbergella monmouthensis (Olsson 1960)
Perrilliat and Vega 2001
Heterohelicidae
Heterohelix globulosa (Ehrenberg 1840)
Perrilliat and Vega 2001
Globotruncanidae
Gansserina gansseri (Bolli 1951)
Perrilliat and Vega 2001
Rugoglobigerina rugosa (Plummer 1927)
Perrilliat and Vega 2001
Globotruncana ventricosa
Perrilliat and Vega 2001
Globotruncana linneiana (d'Orbigny 1839)
Perrilliat and Vega 2001
Rosita fornicata
Perrilliat and Vega 2001
Gastropoda - Neogastropoda - Fasciolariidae
Drilluta gloriae
Drilluta gloriae Perrilliat et al.
Gastropoda - Neogastropoda
Mexfusus rotundicostatus n. gen., n. sp. Vermeij et al. 2004
Vermeij et al. 2004
Gastropoda - Xenophoridae
Acanthoxenophora sinuosa n. gen., n. sp. Perrilliat and Vega 2001
Perrilliat and Vega 2001
Bivalvia - Pectinida - Pectinidae
Camptonectes sp. Meek 1864
Camptonectes sp.
Bivalvia - Mytilida - Crenellidae
Crenella serica Conrad 1860
Crenella serica Conrad
Bivalvia - Nuculida - Nuculidae
Nucula ciboloensis
Nucula ciboloensis Stephenson
see common names

Geography
Country:Mexico State/province:Guerrero
Coordinates: 18.2° North, 98.9° West (view map)
Paleocoordinates:24.2° North, 80.8° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Maastrichtian 10 m.y. bin:Cretaceous 8
*Period:Late/Upper Cretaceous *Epoch:Senonian
*International age/stage:Early/Lower Maastrichtian
Key time interval:Late/Upper Maastrichtian
Age range of interval:70.60000 - 66.00000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Mexcala
Stratigraphic resolution:group of beds
Stratigraphy comments: Was scored as Early Maastrichtian. However: “An upper Maastrichtian age for the beds that contain the specimens here described was inferred based upon the presence of the following index species of foraminifera: Gansserina gansseri (Bolli). Rosita fomicata (Plummer), Globotruncana ventricosa (White). G. linn eiana (d'Orbigny), Rugoglobigerina rugosa (Plummer), Hedbergella monmouthensis (Olsson). and Heterohelix globulosa (Ehrenberg). These species were identified by Brian Huber (personal communication)."
Lithology and environment
Primary lithology:brown marl
Secondary lithology:fine calcareous sandstone
Environment:marine indet.
Geology comments: The assemblage of invertebrate fauna is interpreted as shallow marine, possibly associated with a deltaic system. However, the abundance of planktic foraminifera and the broken delicate structures of the gastropod shells (aperture and spines), suggest that the material was reworked into a deeper environment, contemporaneously with the deposition of the planktic foraminifera.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Spatial resolution:allochthonous
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: IGM (Museo Paleontologia del Instituto Geologia, Universidad Nacional Autonoma de Mexico)
Taxonomic list comments:The fauna is now known to include planktic and benthic foraminifera; solitary, shallow-water hermatypic corals; gastropods; bivalves, scaphopods; reworked ammonoids and nautiloids; crabs; spatangoid echinoids; marine vertebrate remains; and palynomorphs. Previous paleontologic work on this fauna includes a species of retroplumid crab (Vega & Feldmann, 1992), as we ll as preliminary reports on the mollusks (Salccda ct al., 1995; Vega & Perrilliat, 1995; Perrilliat & Vega, 1996); and echinoids (Sanchez-Rodriguez et al., 1995; Sanchez-Rodriguez, 1997).
Metadata
Database number:7463
Authorizer:M. Kosnik, P. Wagner, M. Clapham Enterer:M. Kosnik, P. Wagner, B. Santos
Modifier:B. Santos Research group:marine invertebrate
Created:2000-07-18 12:00:01 Last modified:2019-10-18 11:41:29
Access level:the public Released:2000-07-18 12:00:01
Creative Commons license:CC BY
Reference information

Primary reference:

489. M. C. Perrilliat, F.J. Vega, and R. Corona. 2000. Early Maastrictian mollusca from the Mexcala formation of the state of Guerro, southern Mexico. Journal of Paleontology 74(1):7-24 [M. Kosnik/M. Kosnik/J. Alroy]

Secondary references:

58995 M. C. Perrilliat and F. J. Vega. 2001. A new genus and species of Late Cretaceous xenophorid gastropod from southern Mexico. The Veliger 44(1):73-78 [P. Wagner/P. Wagner]
70509 G. J. Vermeij, G. S. Herbert, F. J. Vega and M. C. Perrilliat. 2004. Mexfusus rotundicostatus, a New Genus and Species of Neogastropod from the Late Cretaceous of Southern Mexico. Journal of Paleontology 78(6):1123-1127 [M. Clapham/B. Santos]