New regulatory tool for the conservation of the geological heritage in France: the Prefectural Decree of the Protection of the Geotope (APPG). Application and feedback in the Yvelines department (Paris basin, Île-de-France)

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In France, the conservation of geological heritage has a complex history that dates back to the middle of the 19th century. Two regulatory tools, “Site Classé”, established in 1906, and Natural Reserves, created in 1976, have served to protect geological sites in the past. Nonetheless, these tools are long to implement vis-à-vis to the rapid destruction of geological objects in the French territory. Due to this juridical void, the state created in 2015 two prefectural decrees for the protection of geological sites of interest. These tools allow the Prefect to: (i) determine a departmental list of geological sites of importance; (ii) define appropriate regulations for their conservation through the Prefectural Decree of the Protection of the Geotope (APPG). Their decentralised legal proceedings appear to be easy to administer, as they only require the advice of regional and departmental commissions as well as some local stakeholders. Our article reports the first enactment of the APPG in France, in a peri-urban to urban area, the Yvelines department. By relying on the programmes of Strategy of Creation of Protected metropolitan Areas (SCAP) and the National Inventory of the Geological Heritage (INPG), two geological sites of international value threatened by anthropic activities were selected for the APPG: the Lutetian fossil sites of Grignon and the Ferme de l’Orme. If successfully enacted, the APPG could prove advantageous because it is a tool adapted to the protection of geological objects and to its socio-economic and environmental context. However, after almost two years, the proceedings of the APPG have not been finalised. Optional yet beneficial steps, as well as unforeseen requests, delayed the process considerably. Given that the APPG do not confer protection to the geological sites during this period, their efficacy must be questioned in a fast-evolving region where land pressure is high and geological sites disappear quickly. However, the French juridical system has improved in the recent years in that it encourages Earth Sciences specialists to form part of local consultative instances (CSRPN, CDNPS) and thereby influence the decisions concerning the protection of these highly threatened sites.