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Farola (FL1) (Neogene of Argentina)

Where: Buenos Aires, Argentina (39.0° S, 61.7° W: paleocoordinates 39.1° S, 60.3° W)

• coordinate stated in text

When: Montehermosan (6.8 - 4.0 Ma)

• The complete sedimentary sequence includes three stratigraphic units (Zavala, 1993): the Monte Hermoso Forma- tion (Lower–Middle Pliocene), Puerto Belgrano Formation (Upper Pleistocene) and Punta Tejada Formation (Upper Pleistocene–Middle Holocene). The Monte Hermoso Formation (Zavala, 1993) crops out at the abrasion platform and the lower part of the cliff, along its entire extension, with a maximum thickness of up to 6 m. Zavala and Navarro (1993) interpreted that the Monte Hermoso Formation was deposited through a fluvial dynamic of high sinuosity muddy fine-grained rivers. These authors identified architectural elements of channel, lateral accretion deposits and overbank deposits.

Environment/lithology: "floodplain"; lithified, muddy siltstone and lithified, silty siltstone

• The floodplain taphonomic mode was recognized in Farola (FL 1). The taphonomic characteristics of this mode partially correspond to those of model I (rapidly accumulated and buried elements), and model II (resedimented elements, with considerable exposure before burial), proposed by Johnson (1960) for putative formation mechanisms of fossil assemblages.
• The FL 1 is included in deposits mainly composed by muddy silt- stones, with colors that range from reddish brown to yellowish brown. Reddish brown sandy siltstones and silty sandstones are present too. These deposits have a massive structure in the middle– upper sector, while in the lower one they show a very fine lamination.

Size classes: macrofossils, mesofossils, microfossils

Preservation: original phosphate

Collection methods: Fossil remains are deposited in the 'Museo Municipal de Ciencias Naturales Carlos Darwin' (Punta Alta, Buenos Aires), under the acronym MD-FM.

Primary reference: R. L. Tomassini and C. I. Montalvo. 2013. Taphonomic modes on fluvial deposits of the Monte Hermoso Formation (early Pliocene), Buenos Aires province, Argentina. Palaeogeography, Palaeoclimatology, Palaeoecology 369:282-294 [C. Jaramillo/A. Cardenas ] more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 152062: authorized by Carlos Jaramillo, entered by Andrés Cardenas on 05.11.2013

Creative Commons license: CC BY (attribution)