Bioestratigrafía y sedimentología de los sedimentos detríticos del sector de Macandamine sección Nº3

Abstract

Abstract: This work includes a paleontological study, chronostratigraphic sequences, facies, and sedimentary environments found in the Macandamine neighborhood. Section 3 is located in the parish of Casanga, part of the Paltas canton. The Casanga Formation is estimated to be 200 to 400 m thick and is unconformably overlain in the northeast direction by the Rio Playas Formation. A detailed paleontological study has not been carried out in the Macandamine sector; therefore, this research was conducted to analyze the fossil record, which provides a local view of the fossil potential in this area. For its correct characterization, a total of 9 samples were collected and used in different analyses. The results obtained through granulometry and sedimentology analyses allowed for the construction of a precise chronostratigraphic sequence based on grain sizes ranging from coarse to fine sandstones. The biostratigraphic study with planktonic foraminifera corroborates the Coniacian age data. Finally, the taphonomic index based on the triangle of the ternary taphogram in relation to benthic foraminifera suggests contributions from the Maestra platform.