| Géologique de Saucats et La Brède National Nature Reserve | |
| Iucn Category: | III |
| Coordinates: | 44.654°N -0.5969°W |
| Area: | 75.5 ha |
| Established: | 5 September 1982 |
| Governing Body: | Association RNG Saucats-La Brède |
| Saucats et La Brède Geologic Formation | |
| Type: | Fossil sites |
| Period: | Miocene |
| Prilithology: | Faluns |
| Namedfor: | Saucats and La Brède |
| Country: |  France |
| Coordinates: | 44.654°N -0.5969°W |
The Géologique de Saucats et La Brède National Nature Reserve (RNN62) is a geological national nature reserve in Gironde. Established in 1982 with an area of 75.5ha, it protects six sites bearing outcrops of solidified shell sand or faluns. It also includes the stratotype for the Aquitanian and Burdigalian stages.[1]
It is located in Nouvelle-Aquitaine in the Gironde department, over the communes of Saucats and La Brède 20km (10miles) south of Bordeaux and in the heart of the Landes forest. It includes six sites divided ito three geographic sectors, and covers a total area of 75.5ha.
Belonging to the Aquitaine Basin, this site bears an important series of deposits from the Cenozoic era, in the shape of outcrops. Those can be seen particularly on the banks of two streams: the Saucats (or St Jean d'Étampes) and its tributary the Brousteyrot. Some of those outcrops served as basis for the description of the Aquitanian stratotype (established by Charles Mayer in 1858) and the Burdigalian stratotype (established by Charles Depéret in 1892). Those were regularly studied by paleontologists for nearly a century (including Benoist, Degrange-Touzin, Cossmann, Peyrot, and Daguin) and exploited by various collectors until the creation of the nature reserve. In 1980 the Association pour la Réserve Géologique de Saucats - La Brède was established to protect this patrimony and to open it up. The nature reserve was established in 1982 under ministerial order. It was the first geological reserve in France.
The principal interest of this site is geological. Most of the stages can be seen across the narrow streams in small glens; they include interesting biotes.
The reserve includes three Cenozoic stages (Neogene, Miocene); Aquitanian (23 to 20.5 Ma); Burdigalian (20.5 to 16.4 Ma); and Serravallian (14.8 to 11.2 Ma).
Riparian forests include the common alder, the yellow flag, and the marsh-marigold. The Bernachon site exhibits a large diversity of bryophytes.
The sites are frequented by the European mink, the common genet, the common kingfisher and the grey wagtail. Among the local amphibians, the fire salamander and the marbled newt can be found.
Apart from the Reserve House, the most important areas of the nature reserve are: the "musées de site" (open-air showcases or amenaged cliffs) of Bernachon and L'Ariey for the Aquitanian stage; Péloua, la Bourasse and Pont-Pourquey (Burdigalian); and Lassime (Serravallian).
The nature reserve gestion is under responsibility of the Association de gestion de la réserve géologique de Saucats et La Brède.
The nature reserve was established under decree of 5 September 1982.[2]