IGM-2448, Temalac (Cretaceous of Mexico)

Where: Guerrero, Mexico (18.2° N, 98.9° W: paleocoordinates 24.2° N, 80.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Mexcala Formation, Early/Lower Maastrichtian (70.6 - 66.0 Ma)

• 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.).

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified siltstone

Size class: macrofossils

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 7461: authorized by Matt Kosnik, entered by Matt Kosnik on 18.07.2000, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Trochoidea - Nododelphinulidae
Nododelphinula diminuta snail
Nododelphinula diminuta Perrilliat et al.
 Seguenzioidea - Eucyclidae
Calliomphalus (Planolateralus) argenteus snail
Calliomphalus (Planolateralus) argenteus Wade
Calliomphalus (Planolateralus) mexcalensis snail
Calliomphalus (Planolateralus) mexcalensis Perrilliat et al.
Calliomphalus (Planolateralus) sp. Cossmann 1888 snail
Calliomphalus (Planolateralus) sp.
Calliomphalus (Planolateralus) cf. decoris Sohl 1960 snail
Calliomphalus (Planolateralus) cf. C. (P.) decoris Sohl
 Epitonioidea - Epitoniidae
Striaticostatum cf. bexarense Stephenson 1941 wentletrap
Striaticostatum cf. S. bexarense Stephenson
Opalia (Opalia) "sp. A" Adams and Adams 1858 wentletrap
Opalia (Opalia) sp. A Perrilliat et al. 2000
Opalia (Opalia) "sp. B" Adams and Adams 1858 wentletrap
Opalia (Opalia) sp. B Perrilliat et al. 2000
Epitonium cf. faearium Dockery 1993 wentletrap
Epitonium cf. E. faearium Dockery
Belliscala sp. Stephenson 1941 wentletrap
Belliscala sp.
 Cerithioidea - Pachychilidae
"Pyrazus pyramidatus" = Jponsia geslini
"Pyrazus pyramidatus" = Jponsia geslini Deshayes 1833 snail
Pyrazus pyramidatus Deshayes
 Cerithioidea - Turritellidae
Turritella cf. chalybeatensis turret shell
Turritella cf. T. chalybeatensis Sohl
"Haustator trilira" = Turritella trilira Conrad 1860 turret shell
Turritella trilira Conrad
Turritella vertebroides Morton 1834 turret shell
Turritella vertebroides Morton
 Cerithioidea - Potamididae
Potamides temalacensis, "Ptychopotamides ancestralus" = Potamides (Ptychopotamides)
Potamides temalacensis horn snail
Potamides temalacensis Perrilliat et al.
"Ptychopotamides ancestralus" = Potamides (Ptychopotamides) horn snail
Ptychopotamides ancestralus Perrilliat et al.
 Architaenioglossa - Ampullinidae
Pseudamaura cf. lepta Sohl 1964 snail
Pseudamaura cf. P. lepta Sohl
 Sorbeoconcha - Rostellariidae
? Calyptraphorus sp. Conrad 1857 snail
Calyptraphorus? sp.
 Sorbeoconcha - Aporrhaidae
Pugnellus (Pugnellus) densatus snail
Pugnellus (Pugnellus) densatus Conrad
 Neogastropoda - Pyropsidae
Pyropsis lanhami Stephenson 1941 snail
Pyropsis lanhami Stephenson
 Neogastropoda - Fasciolariidae
Remera sp. Stephenson 1941 snail
Remera sp.
Bellifusus curvicostatus Wade 1926 snail
Bellifusus curvicostatus curvicostatus (Wade)
Drilluta gloriae snail
Drilluta gloriae Perrilliat et al.
? Paleopsephaea sp. Wade 1926 snail
Paleopsephaea? sp.
Paleopsephaea mutabilis Wade 1926 snail
Paleopsephaea mutabilis Wade
 Neogastropoda - Volutidae
Volutomorpha cf. retifera Dall 1907 volute
Volutomorpha cf V. retifera Dall
 Sorbeoconcha - Naticidae
Amaurellina guerrera moon snail
Amaurellina guerrera Perrilliat et al.
Euspira rectilabrum Conrad 1858 moon snail
Euspira rectilabrum Conrad
Gyrodes (Gyrodes) supraplicatus Conrad 1858 moon snail
Gyrodes (Gyrodes) supraplicatus (Conrad)
Gyrodes (Gyrodes) major Wade 1926 moon snail
Gyrodes (Gyrodes) major Wade
 Sorbeoconcha - Triforidae
Cerithiella aequalirata Dockery 1993 snail
Cerithiella aequalirata Dockery
Cerithiella nodoliratum Wade 1926 snail
Cerithiella nodoliratum Wade
 Heterostropha - Ringiculidae
"Ringicula (Ringicula) cf. clarki" = Ringicula (Ringiculina) clarki
"Ringicula (Ringicula) cf. clarki" = Ringicula (Ringiculina) clarki Durham 1944 snail
Ringicula (Ringicula) cf. R. (R.) clarki Gardner
 Stylommatophora - Urocoptidae
Holospira sp. Martens 1860 slug
Holospira sp.
 Heterostropha - Architectonicidae
Granosolarium coffea Sohl 1964 snail
Granosolarium coffea Sohl
 Opisthobranchia - Cylichnidae
Cylichna secalina Shumard 1861 snail
Cylichna secalina Shumard
 Neritoidea - Neritidae
Nerita cf. divaricata snail
Nerita cf. N. divaricata Orbigny
Bivalvia
 Pectinida - Plicatulidae
"Plicatula batnensis" = Plicatula (Plicatula) ferryi
"Plicatula batnensis" = Plicatula (Plicatula) ferryi Coquand 1862 scallop
Plicatula batnensis Coquand
 Pectinida - Neitheoidae
Neithea (Neithea) cf. youngi scallop
Neithea (Neithea) cf. N. (N.) youngi Myers
 Pholadida - Corbulidae
Caestocorbula crassiplica Gabb 1860 clam
Corbula crassiplica Gabb
Corbula cf. paracrassa Wade 1926 clam
Corbula cf. C. paracrassa Wade
 Cardiida - Arcticidae
Veniella cf. jamaicensis clam
Veniella cf. V. jamaicensis (Trechmann)
Veniella sp. Stoliczka 1870 clam
Veniella sp.
 Cardiida - Cardiidae
Cardium sp. Linnaeus 1758 cockle
Cardium sp.
? Protocardia sp. Beyrich 1845 cockle
Protocardia? sp.
 Carditida - Astartidae
Astarte similis Munster 1840 clam
Astarte similis Muenster
 Nuculida - Nuculidae
Nucula ciboloensis nut clam
Nucula ciboloensis Stephenson
 Nuculanida - Nuculanidae
Nuculana corsicana pointed nut clam
Nuculana corsicana Stephenson
Malacostraca
 Decapoda - Longusorbiidae
Longusorbis quadratus n. sp. Fraaije et al. 2006 crab
 Decapoda - Retroplumidae
Costacopluma bishopi n. sp. Vega and Feldmann 1992 crab