Resumo

ISLA, Federico; DONDAS, Alejandro  e  OLIVA, Cristian. Sedimentology of the Irene and la toma formations from the neogene of the Claromecó basin, Buenos Aires. Geoacta [online]. 2014, vol.39, n.2, pp.1-13. ISSN 1852-7744.

The Claromecó Basin is located between the horst of Tandil and Ventania. The Irene formation is defined to the west of the Interserrana ("between ranges") Plain, Buenos Aires Province, for light-coloured carbonatic siltstones with joints that sums 7 m thick at the locality close to Irene Railway Station. These rocks comprising the Araucanense are underlying reddish sandy silts assigned to the Pampian sediments of La Toma Formation. According to the fossiliferous and escoria content, these sediments were similar to those outcropping as Monte Hermoso and Chapadmalal formations. It is therefore assumed a Pliocene age for the upper levels of the Irene Formation, as well as to the La Toma Formation. The hilly landscape is crowned by silt with calcretes.

Palavras-chave : Irene Formation; La Toma formation; Pliocene; Buenos Aires.

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