La cobertura sedimentaria precámbrica – paleozoica inferior del Sistema de Tandilia.

POIRÉ, D.G.; SPALLETTI, L.A.

Relatorio sobre la Geología y Recursos Minerales de la Provincia de Buenos Aires

Asociación Geológica Argentina

Lugar: Buenos Aires; Año: 2005; p. 51 - 68

The common feature of the sedimentary cover of Tandilia is that the deposits have been formed in a shallow epeiric sea. The Sierras Bayas Group (167 m) is composed of four depositional sequences separated by regional unconformities. From base to top the succession is constituted by quartz-arkosic arenites, dolostones and shales, followed by quartz arenites, claystones and dark micritic limestones. The Cerro Negro Formation is a more than 100 m succession of claystones and heterolithic sandstone-claystone interbeds. The Balcarce Formation (100 m) is made up of quartz arenites with subordinated claystones and fine-grained conglomerates.