Basalt organs at the Cascade du Déroc. On the Aubrac lake routeBasalt organs at the Cascade du Déroc. On the Aubrac lake route
©Basalt organs at the Cascade du Déroc. On the Aubrac lake route

The geology of Aubrac

Between glacial lakes, basaltic waterfalls and erratic boulders ...

The geology of Aubrac and its curiosities… The shapes that nature offers us here are fascinating:

Where do these extraordinary-looking stones come from? Basalt organs and other erratic boulders are remnants of ancient volcanic activity on the Aubrac plateau, as well as of previous ice ages.

Aubrac, between basaltic organs and erratic stones

Aubrac is a volcanic massif 5 to 9 million years old. Its highest point is the Signal de Mailhebiau (1469 meters).

It is bordered by rivers: the Lot to the south, the Truyère to the north and the Colagne to the east. The plateau is made up of a variety of rocks. On the foothills of the plateau, near the Lot valley, we find a lot of gneiss and schist. In the center, basalt, a reminder of the area’s volcanic origins, is omnipresent.

The Aubrac volcanic massif

The creation of the basaltic part of the plateau is the result of an effusive volcanic episode (with lava flows). Traces of this ancient volcanic activity abound here, with basaltic organs sometimes appearing in unexpected places.

Among the most impressive are waterfalls such as Déroc and Saltou.

The Aubrac, a mysterious landscape

In the foothills of Aubrac, the landscape contrasts with the great bare expanses of the plateau to the north.

Covered mainly by mysterious beech forests, this is the land of the boraldes, the streams that meander through the deep valleys to flow into the Lot.

Where to find

basaltic organs and erratic boulders

on the Aubrac?

Basalt organs and erratic boulders can be found mainly at Cascade du Déroc

Located in the south of France, in the Occitanie region, the Cascade du Déroc is on the Aubrac plateau.

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