IGM-2448, Temalac: Early Maastrichtian, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Triforidae
Cerithiella aequalirata Dockery
Cerithiella nodoliratum Wade
Gastropoda - Naticidae
Amaurellina guerrera Perrilliat et al.
Gyrodes (Gyrodes) major Wade
Gyrodes (Gyrodes) supraplicatus (Conrad)
Euspira rectilabrum (Conrad 1858)
Euspira rectilabrum Conrad
Gastropoda - Rostellariidae
Calyptraphorus? sp.
Gastropoda - Aporrhaidae
Pugnellus (Pugnellus) densatus Conrad
Gastropoda - Neogastropoda - Volutidae
Volutomorpha cf V. retifera Dall
Gastropoda - Neogastropoda - Pyropsidae
Pyropsis lanhami Stephenson 1941
Pyropsis lanhami Stephenson
Gastropoda - Neogastropoda - Fasciolariidae
Paleopsephaea? sp.
Paleopsephaea mutabilis Wade
Bellifusus curvicostatus curvicostatus (Wade)
Drilluta gloriae Perrilliat et al.
Remera sp. Stephenson 1941
Remera sp.
Gastropoda - Ampullinidae
Pseudamaura cf. P. lepta Sohl
Gastropoda - Epitoniidae
Opalia (Opalia) sp. A Perrilliat et al. 2000
Opalia (Opalia) sp. B Perrilliat et al. 2000
Epitonium cf. E. faearium Dockery
Striaticostatum cf. S. bexarense Stephenson
Belliscala sp. Stephenson 1941
Belliscala sp.
Gastropoda - Pachychilidae
Pyrazus pyramidatus (Deshayes 1833)
Pyrazus pyramidatus Deshayes
Gastropoda - Turritellidae
Haustator trilira (Conrad 1860)
Turritella trilira Conrad
Turritella vertebroides Morton
Turritella cf. T. chalybeatensis Sohl
Gastropoda - Potamididae
Potamides temalacensis Perrilliat et al.
Ptychopotamides ancestralus Perrilliat et al.
Gastropoda - Heterostropha - Architectonicidae
Granosolarium coffea Sohl
Gastropoda - Heterostropha - Urocoptidae
Holospira sp. Martens 1860
Holospira sp.
Gastropoda - Heterostropha - Ringiculidae
Ringicula (Ringicula) cf. R. (R.) clarki Gardner
Gastropoda - Eucyclidae
Calliomphalus (Planolateralus) mexcalensis Perrilliat et al.
Calliomphalus (Planolateralus) sp.
Calliomphalus (Planolateralus) argenteus Wade
Calliomphalus (Planolateralus) cf. C. (P.) decoris Sohl
Gastropoda - Nododelphinulidae
Nododelphinula diminuta Perrilliat et al.
Gastropoda - Opisthobranchiata - Cylichnidae
Cylichna secalina Shumard 1861
Cylichna secalina Shumard
Gastropoda - Neritidae
Nerita cf. N. divaricata Orbigny
Bivalvia - Nuculida - Nuculidae
Nucula ciboloensis Stephenson
Bivalvia - Nuculanida - Nuculanidae
Nuculana corsicana Stephenson
Bivalvia - Carditida - Astartidae
Astarte similis Munster 1840
Astarte similis Muenster
Bivalvia - Pholadida - Corbulidae
Corbula cf. C. paracrassa Wade
Corbula crassiplica Gabb
Bivalvia - Cardiida - Cardiidae
Cardium sp. Linnaeus 1758
Cardium sp.
? Protocardia sp. (Beyrich 1845)
Protocardia? sp.
Bivalvia - Cardiida - Arcticidae
Veniella cf. V. jamaicensis (Trechmann)
Veniella sp. Stoliczka 1870
Veniella sp.
Bivalvia - Pectinida - Neitheidae
Neithea (Neithea) cf. N. (N.) youngi Myers
Bivalvia - Pectinida - Plicatulidae
Plicatula batnensis Coquand 1880
Plicatula batnensis Coquand
Malacostraca - Decapoda - Retroplumidae
Costacopluma bishopi n. sp. Vega and Feldmann 1992
Fraaije et al. 2006
Malacostraca - Decapoda - Longusorbiidae
Fraaije et al. 2006
see common names

Geography
Country:Mexico State/province:Guerrero
Coordinates: 18.2° North, 98.9° West (view map)
Paleocoordinates:28.6° North, 71.8° West (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Maastrichtian 10 m.y. bin: Cretaceous 8
*Period:Late/Upper Cretaceous *Epoch:Senonian
*International age/stage:Early/Lower Maastrichtian
Key time interval: Early Maastrichtian
Age range of interval: 72.2 - 66 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Mexcala
Stratigraphic resolution:group of beds
Stratigraphy comments: Fraaije et al. (2006) argued for a Coniacian age on the basis of regional biostratigraphy in Lang & Frerichs (1998), which identified species indicating the Dicarinella concavata biozone in the lower part of the Mexcala Formation. Fraaije et al. (2006) argued that IGM-2448 was at the base of the Mexcala Formation, just above the Turonian Morelos Formation. However, Perrilliat et al. (2000) reported planktic foraminiferans from locality IGM-2448 itself, including Gansserina gansseri, Rosita fornicata, Globotruncana ventricosa, G. linneiana, Rugoglobigerina rugosa, Hedbergella monmouthensis, and Heterohelix globulosa, indicative of an early Maastrichtian age (Brian Huber, pers. comm.).
Lithology and environment
Primary lithology: lithified siltstone
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Database number:7461
Authorizer:M. Kosnik, M. Clapham Enterer:M. Kosnik, M. Clapham
Modifier:M. Clapham Research group:marine invertebrate
Created:2000-07-18 12:00:01 Last modified:2025-02-22 15:12:02
Access level:the public Released:2000-07-18 12:00:01
Creative Commons license:CC0
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:

40983decapod R. H. B. Fraaije, F. J. Vega, B. W. M. Bakel and L. M. Garibay-Romero. 2006. Late Cretaceous dwarf decapods from Guerrero, southern Mexico and their migration patterns. Contributions to Zoology 75(3/4):121-132 [C. Schweitzer/E. Johnson/E. Johnson]