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Farola Monte Hermoso St Facies (Pliocene of Argentina)

Also known as Piso Chapadmalense St Facies

Where: Buenos Aires, Argentina (39.0° S, 61.7° W: paleocoordinates 39.0° S, 60.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Montehermosan mammal zone, Monte Hermoso Formation, Early/Lower Pliocene (5.3 - 3.6 Ma)

• The lateral accretion deposits are mainly represented at the

•middle sector of the cliff, and include the St, Sr, Fsc and Fcf facies.

•These levels are equivalent to the “Piso Chapadmalense” of Vignati

•(1948), the “Miembro de Limolitas Estratificadas” and “Miembro de

•Limolitas Claras” of Bonaparte (1960), the “Unidad B” of Fidalgo

•et al. (1975), and the “Unidad Litoestratigráfica II” of Fidalgo and

•Tonni (1982)

Environment/lithology: fluvial; brown, green breccia

• The St facies is composed of dark brown to greenish clastsupported

•breccias, composed of silty and sandy intraclasts over

•15 cm in diameter, some of them rounded, and a silt-sand matrix. In

•some sections, this facies is massive; while a planar cross-bedding

•is observed in others

Size classes: macrofossils, mesofossils

Preservation: trace

Collection methods: All the materials are housed in the Museo

•Municipal de Ciencias Naturales “Carlos Darwin” (Punta Alta,

•Buenos Aires), under the acronym MD-FM.

Primary reference: R. L. Tomassini, C. I. Montalvo, C.M. Deschamps and T. Manera. 2013. Biostratigraphy and biochronology of the Monte Hermoso Formation (early Pliocene) at its type locality, Buenos Aires Province, Argentina. Journal of South American Earth Sciences 48:31-42 [C. Jaramillo/M. Vallejo] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 152085: authorized by Carlos Jaramillo, entered by Maria Vallejo on 06.11.2013

Creative Commons license: CC BY (attribution)