FIGURE 1. Distribution of the studied outcrops and location of measured sections in Cordillera Oriental, northwest Argentina (modified from Astini 2003). 1 = Quebrada Azul (Sierra de Cajas), 2 = Azul Pampa (including Cerro Crestón and Old Road), 3 = Arroyo Sapagua (including Sapagua East and West), 4 = Los Colorados, 5 = Angosto del Moreno, 6 = Quebrada de Moya and Chucalezna, 7 = Quebradas del Arenal and Humacha, 8 = Quebradas de Casa Colorada and Rupasca, 9 = Quebrada del Gallinato.