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Sedimentology And Paleoenvironments Of The Miocene/Pliocene Pisco Fm., Perú, Cristian R. Carvajal
Sedimentology And Paleoenvironments Of The Miocene/Pliocene Pisco Fm., Perú, Cristian R. Carvajal
Loma Linda University Electronic Theses, Dissertations & Projects
The main objective of this research was to understand the sedimentology and depositional environment of the diatomaceous Miocene/Pliocene Pisco Formation in the Ica Valley, Perú. Four stratigraphic sections were studied, sampled and correlated. Field data were integrated with XRD, diatom taxonomy and taphonomy, and thin section analyses to define six facies.
Facies A is composed of diatomaceous siltstone with scour and fill structures formed on a shallow shelf. Facies B was deposited on the transitional zone between the shallow shelf and nearshore where tuffaceous-diatomaceous siltstone and sandstone accumulated. In facies B, lenticular laminations, and flaser, wavy and lenticular bedding record …