The Montvicq coal basin (Allier, France) was formed by infilling of a small mountain lake by detrital Carboniferous sediments characterized by a deltaic facies. A basal conglomerate is overlain successively by sandstones, shales, and coal beds. The southern part of the basin has subsided, and andesite flows are interbedded in the middle of the series. Later orogenic activity caused tilting of the southern margin and subdivision of the sedimentary basin into two structural depressions separated by a faulted and locally folded east-west- trending anticline.

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