“…Most of the terrestrial fossils are found in the Eocene La Meseta Formation (Elliot and Trautman, 1982), which represents the 720-m-thick poorly consolidated sandstone, mudstone, and shell-rich conglomerate fill (Figure 3.1-3) of a 7-km-wide incisedvalley system (Marenssi et al, 1998Marenssi, 2006). Fossil material sampled for this study derives from the estuarine, unconformitybounded Cucullaea I Allomember of Marenssi et al (1998Marenssi et al ( , 2002 and Marenssi (2006) (i.e., level 35 of Montes et al, 2013), belonging to the informal biozone 'Telm 5' of Sadler (1988). Cucullaea I Allomember deposits are characterized by parallel lamination, climbing ripples, flaser-and wavy bedding, small-scale channels, invertebrate burrows, and shell lenses (Elliot and Trautman, 1982;Sadler, 1988;Stilwell and Zinsmeister, 1992).…”