Sandonia

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Sandonia
The Sandonie below Vieux Breuil

The Sandonie below Vieux Breuil

Data
Water code FR :  P7130570
location France , Nouvelle-Aquitaine region
River system Dordogne
Drain over Euche  → Dronne  → Isle  → Dordogne  → Atlantic Ocean
source in the municipality of Léguillac-de-Cercles
45 ° 23 ′ 48 ″  N , 0 ° 29 ′ 44 ″  E
Source height approx.  170  m
muzzle on the municipal boundary between Saint-Just and Paussac-et-Saint-Vivien in the Euche Coordinates: 45 ° 19 ′ 29 ″  N , 0 ° 31 ′ 15 ″  E 45 ° 19 ′ 29 ″  N , 0 ° 31 ′ 15 ″  E
Mouth height 96  m
Height difference approx. 74 m
Bottom slope approx. 7.4 ‰
length 10 km
Catchment area 87 km²
The Sandonie shortly before its mouth at Le Moulin de l'Étang

The Sandonie shortly before its mouth at Le Moulin de l'Étang

The Sandonie is a small river in France that runs in the Dordogne department in the Nouvelle-Aquitaine region . After 10 kilometers it flows as a left tributary into the Euche , a right tributary of the Dronne . Their average gradient is 7.55 m / km.

Flow through communities

geography

The Sandoni Valley near Vieux-Breuil in early March

The Sandonie rises a little north of the hamlet of Jovelle in the municipality of Léguillac-de-Cercles at an altitude of 170 meters. It initially flows south-east, but turns south of the center of Léguillac-de-Cercles in the south. At Loubazac you come across a small dry valley on the left, the only significant side valley. After 9.8 kilometers, it flows into the Euche at Le Moulin de l'Étang at an altitude of 96 meters as a left tributary. On its last kilometer, it forms the municipal boundary between Saint-Just and Paussac-et-Saint-Vivien.

geology

The Sandonia runs exclusively in the flat Upper Cretaceous formations of the northern Aquitaine Basin . The headwaters are located in the fossil limestone of the Coniacium . After the change in direction south of the center of Léguillac-de-Cercles, the river cuts into lower layers of the Upper Angoumia ( Oberturons ) and then the Lower Angoumia. The relatively resistant Rudist limestone of the Angoumiens are steep wall formers in the Lower Angoumien ( Angoulême Formation ) and were extracted as a building block in several quarries. Klausen were also carved out of the rock in some of the walls . At Loubazac , the Sandonie takes on a left-sided dry valley , the course of which marks a fault in the stratification. Further south (south of the hamlet of Breuil ), the Sandonie then meets the La Tour Blanche anticline , which is noticeable by a slight bulge in the layer structure and by two faults. That is why the stratigraphically deeper layers of the Ligérie (flat to bulbous chalk limestone ) are also found in this area . Near the mouth, Lower Angoumien again lines the river valley with Upper Angoumien above, but both formations are formed at this point in the calcarenite facies (typical around Paussac-et-Saint-Vivien).

history

The oldest cultural monument along the river valley is the megalithic cult site Peyre Dermale (on the left side of the valley, not far from Paussac ). In the hamlet of La Blancherie (municipality of Paussac-et-Saint-Vivien) there is a Merovingian necropolis from the sixth century . The Romanesque fortified church in Léguillac-de-Cercles dates from the twelfth century . Limestone mining is likely to go back to the Middle Ages . At Vieux Breuil , troglodytic dwellings were carved out of the rock.

Landmarks on the river

Cluzeau on the left bank of the Sandonie valley north of Le Breuil , municipality of Paussac-et-Saint-Vivien
  • Megalithic place of worship Peyre Dermale west of Paussac .
  • Merovingian necropolis at La Blancherie .
  • Romanesque fortified church in Léguillac-de-Cercles.
  • Troglodytic dwellings near Vieux-Breuil .
  • Climbing rocks in Lower Angoumien (especially near Breuil ).

Web links

Commons : Sandonie  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b geoportail.fr (1: 16,000)
  2. ↑ a b c The information on the length of the river is based on the information about the Sandonie at SANDRE (French), accessed on March 8, 2011, rounded to the nearest kilometer.

literature

  • Floc'h, J.-P. et al .: Feuille Nontron . In: Carte géologique de la France at 1/50 000 . BRGM.
  • Platel, J.-P. et al .: Feuille Périgueux (Ouest) . In: Carte géologique de la France at 1/50 000 . BRGM.
  • Richard, D. et al .: Le Guide Dordogne Périgord . Éditions Fanlac, Périgueux 1993, ISBN 2-86577-162-8 .