Geoconservation Research (Geoconserv. Res.) Establishing the Lower-Middle Jurassic Boundary in the UNESCO Global Geopark Molina & Alto Tajo (Central Spain) Volume 4 (2021) Issue 2, December 2021 - Paleontological Heritage and Geoconservation in the UNESCO European Geoparks (Part II) edited by Dan Grigorescu, Michael Benton, Vachik Hairapetian 2023 11 17 Establishing the Lower-Middle Jurassic Boundary in the UNESCO Global Geopark Molina & Alto Tajo (Central Spain) 10.30486/gcr.2021.1915353.1065 EN Antonio Goy Geological Sciences Faculty, Complutense University, José Antonio Nováis, 12, 28040 Madrid, Spain Spanish Geological Survey (IGME), Ríos Rosas 23, 28003 Madrid, Spain Soledad Ureta Geological Sciences Faculty, Complutense University, José Antonio Nováis, 12, 28040 Madrid, Spain Spanish Geological Survey (IGME), Ríos Rosas 23, 28003 Madrid, Spain Luis Carcavilla Scientific Committee of the Molina-Alto Tajo UNESCO Geopark, Regional Museum of Molina of Aragon, Plaza de San Francisco S / N Regional Museum of Molina, 19300 Molina de Aragon, Spain Spanish Geological Survey (IGME), Ríos Rosas 23, 28003 Madrid, Spain Journal Article 2023 11 17 The Global Boundary Stratotype Section and Point (GSSP) of the Aalenian Stage (base of the Middle Jurassic), was established in Fuentelsaz (Central Spain) by the International Commission on Stratigraphy (ICS) of the International Union of Geological Sciences (IUGS) in 2000. This stratotype is one of the most important geosites of the Molina-Alto Tajo UNESCO Global Geopark. Since the declaration of the Geopark in 2015, several conservation and geotouristic initiatives have been developed for the GSSP, including its protection as Natural Monument.