Geoconservation Research (Geoconserv. Res.) The Armorican Quartzite: when trilobites ruled the Ordovician seas of the Villuercas-Ibores-Jara UNESCO Global Geopark, Spain Volume 4 (2021) Issue 1, June 2021 - Paleontological Heritage and Geoconservation in the UNESCO European Geoparks (I), edited by Dan Grigorescu, Michael Benton, Vachik Hairapetian 2024 01 01 The Armorican Quartzite: when trilobites ruled the Ordovician seas of the Villuercas-Ibores-Jara UNESCO Global Geopark, Spain 10.30486/gcr.2021.1922890.1085 EN Iván Cortijo Villuercas-Ibores-Jara UNESCO Global Geopark. Diputación de Cáceres. C/ Pintores nº 10, 10003 Cáceres, Spain 0000-0002-6027-9002 Sören Jensen Área de Paleontología, Faculta de Ciencias, Avenida de la Física s/n, 06006 Badajoz, Spain 0000-0001-5136-9586 Manolo Garcia C/ Méjico 2, 06220 Villafranca de los Barros, Spain Teodoro Palacios Área de Paleontología, Faculta de Ciencias, Avenida de la Física s/n, 06006 Badajoz, Spain 0000-0002-4917-0559 José María Barrera Villuercas-Ibores-Jara UNESCO Global Geopark. Diputación de Cáceres. C/ Pintores nº 10, 10003 Cáceres, Spain 0000-0002-0818-9325 Journal Article 2024 01 01 Cruziana is a common and widespread trace fossil in Lower Palaeozoic strata that is generally attributed to the activity of trilobites. The Lower to Middle Ordovician Armorican Quartzite Formation of southern Europe contains well-preserved examples of the Cruziana rugosa Group. This paper outlines how Cruziana forms an important part of the geological heritage in the Villuercas-Ibores-Jara UNESCO Global Geopark, Cáceres Province (SW Spain).