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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 (125.5 - 112.6 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)