Istituto di Geoscienze e Georisorse     
Bigazzi G., Bonadonna F., Zanchetta G. Farola Monte Hermoso.Fission-track dating of Darwin's mammals deposit in Argentina. In: Journal of Quaternary Science, vol. 11 (5) pp. 423 - 426. Wiley, 1996.
The Montehermosan Land Mammal Age has been etablished by fission-track dating of the mammal deposit of Farola Monte Hermoso. The fossil bones were found in the lowest part of the outcrop, consisting of fluvially derived clay and silt. The erosional surface between the lowest portion and the overlying aeolian sands is charcterised by a compact unit of rounded volcanic glass shards; a second fresh volcanic ash level is about 1 m above. EDS analyses and fission-track age analyses were performed on the two levels. The age determined for the lower volcanic ash level, 1.7 ±â€‰0.4 Ma, is a minimum age for the Chapadmalalan mammal assemblage and a maximum age for the Uquian mammal assemblage in the Bonaerense area.
URL: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1099-1417
Subject Montehermosan
volcanic ash
EDS microanalysis
fission-track dating

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