Biochronological relationships of the mammal fauna from the Paleogene of Las Violetas, Chubut Province, Argentina

Abstract

The fauna from the Las Violetas locality was recovered from a sequence of 20m thick that outcrops discordantly over the Las Violetas Formation (basal unit of the Río Chico Group). These outcrops are composed of pinky to greyish conglomeradic facies, mainly quartzose in composition, and coarse to fine sandy facies, classified as lithic feldarenites, that represent a distal fluvial system. These features and the stratigraphic position are not conclusive in order to assign this outcrop to a particular unit.