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Limagne
The Limagne is large plain in the Auvergne region of France in the valley of the Allier river, on the edge of the Massif Central. It lies entirely within the ''département'' of Puy de Dôme. The term is sometimes used to include this, and three other less extensive plains, that lie along the valley of the Allier, in which case the first is known as ''Grande Limagne'' to distinguish it from the others. The name is derived from the Latin ''Lacus Magnus'', or large lake.
==Geology==
The Limagne plain is a graben, downthrown from the Massif Central by a series of normal faults that border the western edge of the plain. It contains about 2 km of sediments, and the amount of stretching of the crust is estimated as 1.2–1.3.〔(Allen, P.A. & Allen, J.R. 1990. Basin analysis; Principles and applications, WileyBlackwell, 451pp. )〕 The rifting started in the Late Eocene and the main phase of subsidence continued into the Late Oligocene.〔(Ziegler, P.A. 1990. Geological Atlas of Western Europe, Geological Society London, 256pp. )〕 The Limagne Graben forms part of a system of linked rifts, including the Rhine Graben, known as the European Cenozoic Rift System, that formed in response to compressional deformation of the Alpine foreland.〔
Volcanism accompanied the rifting and continued into the Pleistocene. The sediments deposited in the basin are affected by numerous intrusions. The area was the first where peperites were described, from a basaltic intrusion into lacustrine limestone.〔( de Goer de Herve, A. 2008. Chapter 5, Peperites from the Limagne Trench (Auvergne, French Massif Central), a distinctive feature of phreatomagmatic pyroclastics. History of semantic drift. In: Leyrit, H. & Montenat, C. (Eds.) Volcaniclastic rocks, from magmas to sediments, Taylor & Francis, 270pp. )〕
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