<p>Keywords: monitoring, criteria, degradation, geoheritage, Vale de Meios, Portugal</p><p>Monitoring is one of the main stages in geoconservation strategies, essential to guarantee<br>geoheritage sustainability. Nevertheless, few studies focus on geoheritage monitoring techniques<br>and methods, unlike the multitude of works focusing on procedures to inventory and assess the<br>value of geosites. Moreover, criteria used in these methods can be applied on monitoring<br>procedures, specifically those supporting degradation risk and scientific value quantitative<br>assessments. In this context, a geoheritage monitoring model is being applied in Vale de Meios<br>(Alcanede, Portugal), an abandoned limestone quarry with well-preserved Middle Jurassic<br>Theropod footprints, inside the Serras de Aire e Candeeiros Natural Park. This geosite was<br>previously assessed for its scientific value and vulnerability and it is included in the Portuguese<br>inventory of geoheritage with national and international relevance. A set of &#8220;scientific value&#8221; and<br>&#8220;degradation risk/vulnerability&#8221; criteria were reviewed to assess the degradation of the geosite<br>and used to identify the most suitable monitoring model. The &#8220;integrity&#8221; criterium used in most<br>methods to assess the scientific value of geosites, also credited as &#8220;conservation status&#8221;, is strictly<br>connected with the deterioration of the geoheritage elements in the past and present, while<br>degradation risk is normally referring to the threats and potential losses in the future. Fourteen<br>&#8220;degradation risk&#8221; assessment sub-criteria (intrinsic active processes, deterioration of geological<br>elements, size, extrinsic active processes, proximity to active processes, economic potential,<br>collectible elements potential, protection status, proximity to human activities, accessibility,<br>population density, visitor facilities, degradation by public use, and visitation control) can be<br>distributed by the main criteria fragility, natural vulnerability, anthropic vulnerability, and public<br>use. A detailed analysis of the criteria and the specific characteristics of each geosite support the<br>definition of suitable monitoring indicators. In the Vale de Meios geosite, monitoring actions<br>should primarily consider: active natural process, deterioration of geological elements,<br>accessibility, visitor facilities, degradation by public use, and visitation control in order to define<br>the monitoring indicators. An analysis of the conservation status over the past decades has been<br>carried out, using time indicators of deterioration. Long-term monitoring results will provide more<br>data about the geoheritage degradation though partial data show that in Vale de Meios the main<br>concern is related with the high natural vulnerability of the Theropod footprints, which are<br>exposed to natural erosion. Despite the protection status of the area and design of a plan for<br>visitation control measures, conservation procedures should prioritize physical protection<br>initiatives in the geosite management strategies.</p>