El Chango Quarry (Cretaceous of Mexico)

Where: Chiapas, Mexico (16.6° N, 93.3° W: paleocoordinates 14.6° N, 62.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Cintalapa Formation (Sierra Madre Group), Early/Lower Cenomanian (99.6 - 93.5 Ma)

• Assignment to Sierra Madre based on geographic location; assignment on geologic criteria questioned by authors. Recently, Alvarado-Ortega et al. (2009) found that the fishes found at El Chango (and El Espinal) indicate a Cenomanian age. The presence of the ammonite Graysonites indicate an early Cenomanian age (Moreno-Bedmar et al. 2014).

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal or restricted shallow subtidal; lithified dolomite

• According Vega et al. (2007) these strata accumulated within an estuarine or salty lagoon with ephemeral freshwater influx.
• 3 meters of a monotous dolomitic carbonate sequence; thickness of the strata range from a few millimeters to about 15 cm.

Size class: macrofossils

Collection methods: quarrying

• Repository: IHNFG

Primary reference: J. Alvarado-Ortega, E. Ovalles-Damián, and A. Blanco-Piñón. 2009. The fossil fishes from the Sierra Madre Formation, Ocozocoautla, Chiapas, Southern Mexico. Palaeontologia Electronica 12.2.5A [P. Holroyd/P. Holroyd]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 192074: authorized by Patricia Holroyd, entered by Patricia Holroyd on 06.03.2018, edited by Mark Uhen, Matthew Clapham and Jesus Díaz-Cruz

Creative Commons license: CC BY (attribution)

Taxonomic list

Malacostraca
 Decapoda - Archaeochiapasidae
Archaeochiapasa mardoqueoi n. gen. n. sp.8 Guinot et al. 2019 crab
Cephalopoda
 Ammonitida - Acanthoceratidae
Graysonites sp.9 Young 1958 ammonite
 Ammonitida - Engonoceratidae
? Metengonoceras sp.9 Hyatt 1903 ammonite
Actinopteri
 Gonorhynchiformes - Gonorhynchidae
Sapperichthys chiapanensis n. gen. n. sp.3 Amaral et al. 2013
IHNFG 2986, 2993
 Teleostei -
Scombroclupea javieri n. sp.11 Than-Marchese et al. 2020
IHNFG-5297, 2990, 2992, 5298, 5325, 5326, 5327, 5328
 Ellimmichthyiformes - Paraclupeidae
Paraclupeidae indet. Chang and Chou 1977
IHNFG 2984, 3002
Thorectichthys fideli n. sp.10 Than-Marchese et al. 2023
IHNFG 6152, 5705, 6153, 6154, 6155, 6156
 Aulopiformes - Eurypholidae
Saurorhamphus sp. Heckel 1850
IHNFG 2660, 9084, 9130
 Aulopiformes - Enchodontidae
Vegrandichthys coitecus n. gen. n. sp.7 Díaz-Cruz et al. 2020
IHNFG 5927
Enchodus sp. Agassiz 1835
IHNFG 3004, 3005
Enchodus "sp. 2"5 Agassiz 1835
IHNFG-2653
Enchodus "sp. 1"5 Agassiz 1835
IHNFG-2989
Unicachichthys multidentata n. gen. n. sp.5 Díaz-Cruz et al. 2016
IHNFG-2987, 2988, 4347
Dagon avendanoi n. gen. n. sp.6 Díaz-Cruz et al. 2019
IHNFG-5333
 Acanthomorphata - Aipichthyoididae
Zoqueichthys carolinae n. sp.1 Alvarado-Ortega and Than-Marchese 2012
IHNFG-2224, 2225, 2270
 Beryciformes - Trachichthyidae
Pepemkay maya n. gen. n. sp.2
Pepemkay maya n. gen. n. sp.2 Alvarado-Ortega and Than-Marchese 2013
INHFG-4645
 Acanthopterygii -
Choichix alvaradoi n. gen. n. sp.4
Choichix alvaradoi n. gen. n. sp.4 Cantalice et al. 2021
IGM 11544
 Ichthyodectiformes -
Ichthyodectoidei indet. Romer 1966
IHNFG 2985, 2994, 3000