Cerros Negros Locality (Pleistocene of the United States)

Where: Arizona (32.5° N, 110.6° W: paleocoordinates 32.5° N, 110.6° W)

When: Middle Pleistocene (0.8 - 0.1 Ma)

Environment/lithology: terrestrial; lithified, massive, pebbly, brown, white, conglomeratic, calcareous marl

• A pale-brown, pebble-cobble conglomerate with a calcareous silty matrix and cement is the basal unit (<1 m thick). This basal addition, radiocarbon dates have been established. conglomerate grades upward into a pale-brown silty, clayey marl (±2.5 m thick) overlain by a white, massive marl (±1.5 m)

•containing lesser amounts of clay than the lower marl. Snails are >96 localities in Arizona (Saunders, 1970; Agenbroad and in the upper 3 m of marls, and the total thickness of 4 m has been dated at 27,000 to 12,000 years before present.

Size class: macrofossils

• Mandible with two last molars of Mammuthus Columbi. Mandibular tooth and fragments of enamel of Mammut americanum. Mollusks were recovered.

Primary reference: L. D. Agenbroad, J. I. Mead, C. V. Haynes, Jr. and R. H. Hevly. 2013. Fossil fauna and flora from late Pleistocene Cerros Negros Locality, Pinal County, Arizona: With update of Mammuthus and all Mammut localities from Arizona. 58(1):50-53 [M. Uhen/J. So]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 190076: authorized by Mark Uhen, entered by Jeankyong So on 27.11.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Cardiida - Sphaeriidae
Pisidium sp. Pfeiffer 1821 pea clam
 Pulmonata - Succineidae
Succinea sp. Draparnaud 1801 amber snail
 Pulmonata - Gastrocoptidae
Gastrocopta sp. Wollaston 1878 slug
 Pulmonata - Pupillidae
Vertigo sp. Muller 1774 slug
 Basommatophora - Planorbidae
Gyraulus sp. Charpentier 1837 pulmonate
 Basommatophora - Lymnaeidae
Fossaria sp. Westerlund 1885 pulmonate
 Proboscidea - Mammutidae
Mammut americanum Kerr 1792 American mastodon
Mandibular tooth & fragments of enamel
 Proboscidea - Elephantidae
Mammuthus columbi Falconer 1857 Columbian mammoth
Manidble containing two molars