Méjean causse

Vast Calcareous plate forming integral part of the Large Causses, the causse Méjean or Méjan is most of the plates caussenards with an altitude varying from 800 m to 1247 m with the Gargo mount. The surface of the plate approaches the 34000 [[hectare]] S.

Geography

Located in France in the Massif Central in Lozere, Méjean is girdled impressive valleys of the Jonte in the south, Tarnon in the east and Tarn in north and the west. It owes its name of Méjan, which means “median”, with the central position which it occupies, between the Causse of Sauveterre in north, and the Black Causse in the south.

Geology

The many layers of Sédiment S limestones and dolomitic entirely date almost all from the Jurassic and rest on the benches of sandstone of sorted recovering the base Hercynien (the Schiste S). The thickness of the layers of Calcaire reaches 650 m and up to 1500 m per place. The Géologue S distinguish several types of rocks: limestone (strict direction), which can be massive, marly lity or, the Dolomie, the marnes and the Basalte (some traces resulting from the ic activity Volcan of the recent tertiary sector).

Relief and geomorphology

The concept of plate lets suggest a flat and monotonous landscape. However, the succession of lengthened reliefs rounded or and depressions, the dolomitic chaos break monotony. The west of the plate, low in Altitude, is also parcelled out deep ravines several tens of meters.

Hydrography and climate

No river circulates on the surface of the plates: the rainwater joined the vast networks Karstique S to re-appear in the valleys and to feed the Rivière S of the Tarn and the Jonte by many Résurgence S.

Vegetation

Today, the Causses show a landscape strongly modified, deeply marked by the human print, the breeding primarily. On Méjean, the lawns and the Moor S with Boxwood and Génévrier, sometimes parcelled out plantations of black Pine, cover the oriental party of the plate: the naked Causse. Vast covered undulating spaces of dry lawns are not without evoking a steppe landscape, almost desert. However, one meets while crossing these largely open spaces of many rare and remarkable species. The western part is more wooded (woodland Pin).

Geological site

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