Pereira, Sofia, Jorge Colmenar, Cristiana J.P Esteves, Ícaro Dias Da Silva, Miguel Pires, and Carlos Neto De Carvalho. 2021. “The Enigmatic Upper Ordovician of the Naturtejo UNESCO Global Geopark (Portugal)”. Geoconservation Research 4 (1). https://doi.org/10.30486/gcr.2021.1913408.1053.