Deutsch: Zone Houillère
Français: Zone Houillère
Italiano: Zona Houillère
English: Zone Houillère
The Zone Houillère is the lowest tectonic unit of the Middle Penninic of the Western Alps. It is subdivided by a thrust fault into an external part, dissected into numerous slices, and a more continuous internal part. It comprises mainly Late Carboniferous to Permian metasediments, locally rich in coal (as its name implies), accompanied by Early and Middle Triassic sediments. The rest of the series, from the Middle Triassic upward, was detached to form the Préalpes Médianes Plastiques.
Présence de niveaux de charbon (anthracite) qui furent exploités notamment à Grône, Chippis et Bramois (Valais central).
südliche Anthracitzone (Studer 1872), zone carbonifère (Argand 1911b), Innere Walliser Karbon-Zone = Zone Houillère (Bl. Brig), Carbonifère productif interne = zone productive interne = zone pennique (Lombard 1949), Carbonifère de la région de Salins-Chandoline-Bramois (Vallet 1949), zone du Carbonifère = zone Ferret-Grône (Oulianoff 1957b), Innere Karbonzone (Frey & Niggli 1971), Zone Houillère (Burri 1983, Thélin et al. 1993, TK 500, Gouffon et al. 2024), Zone Houillère Briançonnaise = ZHB (Saliot 1973, Détraz 1984, Bertrand et al. 1998), Zone houillère = Zona permo-carbonifera assiale (Dal Piaz et al. 1992a), zone houillère (Gouffon 1993), Houillère Zone (Gerber 1994), zone houillère briançonnaise = Briançonnais externe (Beucler et al. 2000)
écailles frontales de la nappe du Grand St-Bernard