Caracterización de las facies, ambientes sedimentarios y procesos de depósitos del grupo San Cayetano en el sector Nor-Occidental de la cuenca de Loja, polígono 2

Abstract

Abstract: This study details the characterization of the facies, sedimentary environments, and depositional processes of the San Cayetano Group in the northwestern sector of the Loja Basin, Polygon 2, by describing 11 outcrops. Laboratory analyses of samples such as granulometry, levigation, and X-ray diffraction were performed. Based on the sedimentological study, 8 sedimentary facies were identified, corresponding to the San Cayetano Formation, deposited in two different sedimentary environments. These sedimentary facies were grouped into two stratigraphic units. Unit 1 (outcrops 7, 8, 9, and 10), which are interbedded layers of sand, shale, clay, sandstone, claystone, calcareous sandstone, and a layer of conglomerate facies, has a low textural maturity and was deposited in a fluvial environment. The sediments of Unit 6 (outcrop 11) are fine-grained, well-sorted sediments belonging to a lacustrine environment.