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plural massifs
A principal mountain mass. examples
A block of the earth's crust bounded by faults or flexures and displaced as a unit without internal change; normally consists of gneisses and schists quotations examples
The southern borders of these states are keyed to the same horizontal projection, one surveyed by the frontier planter William Byrd in 1728, while the rivers forming their northern extents fall back just opposite each other from the flanks of the Appalachian massif.
2011, John Jeremiah Sullivan, Pulphead
Some deposits of iron ore are scattered along the edges of the massif in south - central France.
1921, Max Roesler, The Iron-ore Resources of Europe, page 68
The southern portion of the zone from the Maritime Alps to the Pelvoux massif is complicated by the movements which have accompanied the formation of the mountains of Provence.
1891, Carl Diener, “Reviews and Notices”, in The Alpine Journal, volume 15, page 564