Triassic age of the continental Pular Formation, Sierra de Almeida, Antofagasta, northern Chile

NIEMEYER, H., ZAVATTIERI, A.M., BALLENT, S., ZAMUNER, A, GALLEGO, O.

REVISTA GEOLóGICA DE CHILE

Servicio Nacional de Geología y Minería, Chile

Lugar: Santiago; Año: 2008 vol. 35 p. 147 - 161

0716-0208

ABSTRACT. In this contribution, we present a reassessment of the Pular Formation age (Sierra de Almeida, Antofagasta) that in previous papers was attributed to either the Late Paleozoic or Triassic. At Quebrada del Medio, the Pular formation includes a 379-meter-thick stratigraphic section formed from base to top by conglomerates, sandstones, black bituminous shales and limestones, tuffaceous sandstones and a poorly welded ignimbrite that accumulated in fl uvial and lacustrine environments. A multidisciplinary study of the fl ora and fauna was undertaken. The existence of diagnostic Gondwana microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. environments. A multidisciplinary study of the fl ora and fauna was undertaken. The existence of diagnostic Gondwana microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. that in previous papers was attributed to either the Late Paleozoic or Triassic. At Quebrada del Medio, the Pular formation includes a 379-meter-thick stratigraphic section formed from base to top by conglomerates, sandstones, black bituminous shales and limestones, tuffaceous sandstones and a poorly welded ignimbrite that accumulated in fl uvial and lacustrine environments. A multidisciplinary study of the fl ora and fauna was undertaken. The existence of diagnostic Gondwana microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. environments. A multidisciplinary study of the fl ora and fauna was undertaken. The existence of diagnostic Gondwana microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. In this contribution, we present a reassessment of the Pular Formation age (Sierra de Almeida, Antofagasta) that in previous papers was attributed to either the Late Paleozoic or Triassic. At Quebrada del Medio, the Pular formation includes a 379-meter-thick stratigraphic section formed from base to top by conglomerates, sandstones, black bituminous shales and limestones, tuffaceous sandstones and a poorly welded ignimbrite that accumulated in fl uvial and lacustrine environments. A multidisciplinary study of the fl ora and fauna was undertaken. The existence of diagnostic Gondwana microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. environments. A multidisciplinary study of the fl ora and fauna was undertaken. The existence of diagnostic Gondwana microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. fl uvial and lacustrine environments. A multidisciplinary study of the fl ora and fauna was undertaken. The existence of diagnostic Gondwana microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation. fl ora and fauna was undertaken. The existence of diagnostic Gondwana microfl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation.fl ora and macrofl ora allows attributing a Middle Triassic to early Late Triassic age to the Pular Formation.