Table 1. Stratigraphic sections studied.

	Section	Stratigraphic Unit	Age
	Quebrada del Gallinato (Sierra de Mojotoro)	Santa Gertrudis Formation	late Llanvirnian-early Caradocian
	Los Colorados Azul Pampa	Acoite Formation	early-middle Arenigian
	Quebrada de Humacha	Humacha Member (Santa Rosita Formation)	late Tremadocian
	Quebrada de Rupasca Quebrada de Casa Colorada Quebrada del Arenal Angosto del Ferrocarril de Chucalezna	Rupasca Member (Santa Rosita Formation)	late Tremadocian
	Quebrada de Rupasca Quebrada de Casa Colorada Quebrada de Abra Blanca Quebrada de Moya Angosto del Morro de Chucalezna Arroyo Sapagua West Arroyo Sapagua East (Pintayoc) Cerro Crestón (Azul Pampa) Old Road (Azul Pampa)	Alfarcito Member (Santa Rosita Formation)	Furongian-early Tremadocian
	Quebrada de Rupasca Quebrada de Casa Colorada Quebrada de Abra Blanca	Casa Colorada Member (Santa Rosita Formation)	Furongian
	Quebrada Azul (Sierra de Cajas) Angosto del Moreno	Lampazar Formation	Furongian