El Espinal Quarry (Cretaceous of Mexico)

Where: Chiapas, Mexico (16.7° N, 93.5° W: paleocoordinates 14.4° N, 51.1° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Sierra Madre Formation, Aptian (125.0 - 113.0 Ma)

• "lowermost lithofacies" of formation

• group of beds-level stratigraphic resolution

Environment/lithology: paralic; claystone and dolomitic limestone

• "an environment with high oxygen concentration and high primary productivity... a mixture of marine elements... with continental forms..."; sedimentary structures suggest "sporadic influence of strong waves and/or currents..." so sediments "were deposited in a brackish marginal marine environment... shallow lagoon or estuary"
• "fossils found on finely laminated clay layers interbedded with dolomitic limestone... thin orange clay, interbedded with relatively thick layers of cream limestone that range from 5 to 10 cm... some layers show ripples, dessication marks, algal mats, and flat-pebble conglomerates"

Size classes: macrofossils, mesofossils

Preservation: adpression

Collection methods: quarrying,

• material from "a series of shallow excavations exploited by locals"

Primary reference: F. J. Vega, P. García-Barrera, M. Carmen Perrilliat, M. A. Coutiño, and R. Mariño-Pérez. 2006. El Espinal, a new plattenkalk facies locality from the Lower Cretaceous Sierra Madre Formation, Chiapas, southeastern Mexico. Revista Mexicana de Ciencias Geológicas 23(3):323-333 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 68835: authorized by John Alroy, entered by John Alroy on 09.02.2007, edited by Matthew Carrano and Patricia Holroyd

Creative Commons license: CC BY (attribution)

Taxonomic list

• at least two fish species described previously in an abstract and a thesis are present
 Hemiptera - Belostomatidae
? Belostomatidae indet. Leach 1815 giant water bug
 Odonata -
Zygoptera indet. Selys-Longchamps 1854 damselfly
 Decapoda -
Roemerus robustus Bishop 1983 crab
 Decapoda - Palinuridae
Palinurus palaciosi n. sp. Vega et al. 2006 spiny lobster
 Tanaidacea -
Tanaidacea indet. Dana 1849
 Isopoda - Cirolanidae
Cirolanidae indet. Dana 1852 pill bug
 Isopoda - Sphaeromatidae
Sphaeromatidae indet. Latreille 1825 isopod
Ostracoda indet. Latreille 1802 ostracod
Bivalvia indet. Linnaeus 1758 clam
 Stromboidea - Aporrhaidae
? Perissoptera sp. Tate 1865 snail
 Teleostei -
 Salmoniformes - Enchodontidae
Enchodontidae indet.1 Woodward 1901
 Aulopiformes - Eurypholidae
Saurorhamphus sp.2 Heckel 1850
 Teleostei -
Alepisauriformes indet.1 Regan 1911
 Ellimmichthyiformes - Paraclupeidae
Paraclupeidae "genus and species unnamed"2 Chang and Chou 1977
Triplomystus applegatei n. sp.1 Alvarado-Ortega and Ovalles-Damián 2008
INAH 1941
 Teleostei -
Ichthyodectiformes indet.1 Bardack and Sprinkle 1969
 Pycnodontiformes - Pycnodontidae
Pycnodontidae indet.2 Agassiz 1835
 Semionotiformes - Macrosemiidae
Macrosemiocotzus sp.2 González-Rodríguez et al. 2004
Echinoidea indet. Leske 1778 sea urchin
"echinoid plates"
 Ephedrales - Ephedraceae
Ephedra sp. Linnaeus jointfir
 Arecales -
Arecipites sp. Nichols et al. 1973
 Filicales - Osmundaceae
Osmundaceae indet. Berchtold and Presl
Osmunda sp. Linnaeus
  - Selaginellaceae
Selaginella sp. Beauvois 1804
  - Sphagnaceae
Sphagnum sp. Linnaeus
 Urticales - Dilleniidae
Moraceae indet. Link 1835
 Magnoliales - Lauraceae
Lauraceae indet. Jussieu 1789 laurel
 Malvales - Bombacaceae
 Life -
Acritarcha indet. Evitt 1963 acritarcs
"acritarcs" [sic]
 Dinoflagellata -
Dinoflagellata indet.
Pseudoplicapollis sp. Krutzsch 1967