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
Bivalvia | |
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"Plicatula batnensis" = Plicatula (Plicatula) ferryi
"Plicatula batnensis" = Plicatula (Plicatula) ferryi Coquand 1862 scallop Plicatula batnensis Coquand
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Gastropoda | |
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"Pyrazus pyramidatus" = Jponsia geslini
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Potamides temalacensis, "Ptychopotamides ancestralus" = Potamides (Ptychopotamides)
"Ptychopotamides ancestralus" = Potamides (Ptychopotamides) horn snail Ptychopotamides ancestralus Perrilliat et al.
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? Paleopsephaea sp., Paleopsephaea mutabilis, Drilluta gloriae, Bellifusus curvicostatus, Remera sp.
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Cerithiella nodoliratum, Cerithiella aequalirata, Euspira rectilabrum, Amaurellina guerrera, Gyrodes (Gyrodes) supraplicatus, Gyrodes (Gyrodes) major
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Opalia (Opalia) "sp. A", Opalia (Opalia) "sp. B", Belliscala sp., Striaticostatum cf. bexarense, Epitonium cf. faearium
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
Striaticostatum cf. bexarense Stephenson 1941 wentletrap Striaticostatum cf. S. bexarense Stephenson
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Calliomphalus (Planolateralus) argenteus, Calliomphalus (Planolateralus) mexcalensis, Calliomphalus (Planolateralus) sp., Calliomphalus (Planolateralus) cf. decoris
Calliomphalus (Planolateralus) mexcalensis snail Calliomphalus (Planolateralus) mexcalensis Perrilliat et al.
Calliomphalus (Planolateralus) cf. decoris Sohl 1960 snail Calliomphalus (Planolateralus) cf. C. (P.) decoris Sohl
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"Ringicula (Ringicula) cf. clarki" = Ringicula (Ringiculina) clarki
"Ringicula (Ringicula) cf. clarki" = Ringicula (Ringiculina) clarki Durham 1944 snail Ringicula (Ringicula) cf. R. (R.) clarki Gardner
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Malacostraca | |
Longusorbis quadratus n. sp.
Longusorbis quadratus n. sp. Fraaije et al. 2006 crab | |
Costacopluma bishopi n. sp.
Costacopluma bishopi n. sp. Vega and Feldmann 1992 crab |