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Caragua (Miocene of Chile)

Where: Parinacota, Chile (18.5° S, 69.6° W: paleocoordinates 18.8° S, 67.4° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Huaylas Formation, Tortonian (11.6 - 7.2 Ma)

• Our observations along Quebrada Belén indicate that the Huaylas Formation in this area is a largely conglomeratic, gray-colored sedimentary unit with sporadic finer intervals, especially in the basal levels that crop out in the western exposures. The mesotheriid specimens from the various Caragua localities all appear to be from within the lowest part of the formation in the finer sediments (sands to conglomeratic sands). Salinas et al. (1991) noted that the unit varies widely in facies but crop out only in a discontinuous band along the lower courses of the Quebradas Belén and Lupica. The westernmost parts are massive, moderately consolidated siltstones and sandstones with sporadic gravel interbeds in the form of paleochannels; in the central portions, gravels with angular and subangular clasts and sandy matrix dominate; and in the east, immature to mature gravels with conglomerate, sandstone, and siltstone layers appear (Salinas et al., 1991).

• bed-level stratigraphic resolution

Environment/lithology: lacustrine; lithified, sandy, conglomeratic sandstone

• The lowest levels of the Huaylas Formation south of Quebrada Belen (and SE of the Quebradas Belen/Lupica confluence), including the sandy pebble conglomerate that produced the new specimen, appear coarser than those that yielded the more complete specimen reported by Salinas et al. (1991). Munoz and Charrier (1996; Munoz discovered SGO PV 4004) indicated that SGO PV 4004 came from lacustrine beds of the lower Huaylas Formation.

Size class: macrofossils

Preservation: original phosphate

Collection methods: Repository: Museo Nacional de Historia Natural, Santiago, Chile (vertebrate paleontology collections).

Primary reference: J. J. Flynn, D. A. Croft, R. Charrier, A. R. Wyss, G. Hérail and M. García. 2005. New Mesotheriidae (Mammalia, Notoungulata, Typotheria), geochronology and tectonics of the Caragua area, northernmost Chile. Journal of South American Earth Sciences 19(1):55-74 [C. Jaramillo/J. Ceballos/A. Cardenas ] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 144471: authorized by Carlos Jaramillo, entered by Juliana Ceballos on 08.05.2013

Creative Commons license: CC BY (attribution)