Sá, Artur AbreuPinto de Meireles, Carlos AugustoPiçarra, José ManuelVaz, NunoGutiérrez-Marco, Juan Carlos2010-06-282010-06-282009-08Sá, Artur Abreu; Meireles, Carlos; Piçarra, José Manuel; Vaz, Nuno; Gutiérrez-Marco, Juan Carlos - The Hirnantian stratigraphy of Portugal, with notes on the Trás-os-Montes and Valongo-Arouca areas [Abstract]. In: Absolutely final meeting of IGCP 503: Ordovician palaeogeography and palaeoclimate, Abstracts, Copenhagen 2009, August 31-September 4, p. 16http://hdl.handle.net/10400.9/735engEstratigrafia regionalRegião de Valongo (Portugal)Região de Arouca (Portugal)Trás-os-Montes (Portugal)conference object