“…In the Argentine Precordillera, the N. gracilis Zone is documented from several localities of the San Juan Province; particularly, in the Central Precordillera from the Los Azules Formation at the Cerro La Chilca area (Blasco & Ramos, ; Peralta, ), the Las Aguaditas Formation at the Los Blanquitos Range (Brussa, , ; Feltes et al, ; Ortega & Albanesi, ) and the Las Chacritas River section (Serra et al, ) and in the Sierra de La Invernada Formation at the La Invernada Range (Ortega, Albanesi, Banchig, & Peralta, ; Peralta & Finney, ). In the Eastern Precordillera, graptolites of the N. gracilis Zone occur in the La Cantera Formation, at the Don Braulio creek, on the eastern slope of the Villicum Range (Baldis et al, ; Peralta, , ).…”