“…Another locality from Peruvian Amazonia as well, Santa Rosa (Ucayali Department), originally considered as ?late Eocene in age (Frailey and Campbell, 2004), has yielded a rich rodent assemblage (17 taxa), among which the earliest representatives of three caviomorph superfamilies: Erethizontoidea, Octodontoidea, and Cavioidea. However, the late Eocene age of the Santa Rosa locality proposed by Campbell (2004) is highly questioned, with some other authors advocating the possibility of a younger age (i.e., earliest Oligocene or later; Shockey et al, 2004;Croft et al, 2009;Antoine et al, 2012;Kay, 2015;Antoine et al, 2017).…”