The Monts Dore () are the remnant peaks of a volcanic massif situated near the center of the

Massif Central The (; oc, Massís Central, ; literally ''"Central Massif"'') is a highland region in south-central France, consisting of mountains and plateaus. It covers about 15% of mainland France. Subject to volcanism that has subsided in the last 10,00 ...

, in the

Auvergne Auvergne (; ; oc, label=Occitan, Auvèrnhe or ) is a former administrative region in central France, comprising the four departments of Allier, Puy-de-Dôme, Cantal and Haute-Loire. Since 1 January 2016, it has been part of the new region Auverg ...

region of France. They form a picturesque mountainous region, dotted with lakes, thermal springs and romanesque churches. The massif is an integral part of the Parc des Volcans d'Auvergne, and is known for its

alpine ski ''Alpine Ski'' (アルパイン・スキ一) is an Alpine skiing arcade game, released by Taito in 1981. The player controls a skier, who can move left, right, or increase forward speed. The aim is to maneuver a skier through a downhill ski course ...

areas and hiking trails.

Geology

The massif is much older than the nearby

chaîne des Puys The Chaîne des Puys () is a north-south oriented chain of cinder cones, lava domes, and maars in the Massif Central of France. The chain is about 40 km (25 mi) long, and the identified volcanic features, which constitute a volcanic fie ...

, dating to the end of the

Tertiary era Tertiary ( ) is a widely used but obsolete term for the geologic period from 66 million to 2.6 million years ago. The period began with the demise of the non-avian dinosaurs in the Cretaceous–Paleogene extinction event, at the start ...

. It is a deeply eroded

stratovolcano A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and per ...

, similar to the

Cantal Cantal (; oc, Cantal or ) is a Departments of France, department in the Auvergne-Rhône-Alpes Regions of France, region of France, with its Prefectures in France, prefecture in Aurillac. Its other principal towns are Saint-Flour, Cantal, Saint ...

massif to the south, but more reduced in area and volume. Its history began about 3 million years ago with a Plinian eruption that created a large

caldera A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is ...

, the contours of which are no longer clearly defined. This eruption resulted in the emission of

ignimbrite Ignimbrite is a type of volcanic rock, consisting of hardened tuff. Ignimbrites form from the deposits of pyroclastic flows, which are a hot suspension of particles and gases flowing rapidly from a volcano, driven by being denser than the surrou ...

rhyolitic Rhyolite ( ) is the most silica-rich of volcanic rocks. It is generally glassy or fine-grained (aphanitic) in texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass. The mineral ...

pumice Pumice (), called pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular rough-textured volcanic glass, which may or may not contain crystals. It is typically light-colored. Scoria is another vesicular vol ...

that covered over of land. Afterwards,

phonolite Phonolite is an uncommon extrusive rock, of intermediate chemical composition between felsic and mafic, with texture ranging from aphanitic (fine-grained) to porphyritic (mixed fine- and coarse-grained). Phonolite is a variation of the igneous ...

domes were created on the exterior of the caldera. A period of calm lasting between 1 and 1.5 million years ensued, succeeded by a second major eruptive period that formed the modern

Puy de Sancy Puy de Sancy (, ; oc, label=Auvergnat, Puèi de la Crotz , ) is the highest mountain in the Massif Central. It is part of an ancient stratovolcano which has been inactive for about 220,000 years. The northern and southern slopes are used fo ...

, the highest peak in the Massif Central, followed by the establishment of smaller domes,

dikes Dyke (UK) or dike (US) may refer to: General uses * Dyke (slang), a slang word meaning "lesbian" * Dike (geology), a subvertical sheet-like intrusion of magma or sediment * Dike (mythology), ''Dikē'', the Greek goddess of moral justice * Dikes ...

, and

maars A maar is a broad, low-relief volcanic crater caused by a phreatomagmatic eruption (an explosion which occurs when groundwater comes into contact with hot lava or magma). A maar characteristically fills with water to form a relatively shallow ...

. The region is dotted with lakes of volcanic origin. Some are

maar A maar is a broad, low-relief volcanic crater caused by a phreatomagmatic eruption (an explosion which occurs when groundwater comes into contact with hot lava or magma). A maar characteristically fills with water to form a relatively shallow ...

s that have been filled with water, while others are the result of streams whose courses have been blocked by volcanic activity. Volcanic plateaus Geology of France Landforms of Auvergne-Rhône-Alpes Volcanoes of Metropolitan France Maars of France {{AuvergneRhôneAlpes-geo-stub