Editing Thuringian Forest (section)

=== Ruhla anticline ===
[[File:WAK Ruhla 037a.jpg|thumb|Outcrop of amphibolite and mica schist of the Ruhla Group of the Ruhla Crystalline Complex in a former quarry]]
In the Ruhla anticline the basement rocks, folded in the Variscan era, are exposed. They are named ''Ruhlaer Kristallin'' after the location and are according to [[Franz Kossmat]] considered part of the Central German Crystalline Zone, of which [[Odenwald]] and [[Spessart]] are also constituents.<ref name="HenKat">{{cite book | author = Dierk Henningsen, Gerhard Katzung | title = Einführung in die Geologie Deutschlands | issue = 7th issue | publisher = Spektrum Akademischer Verlag | location = München | year = 2006 |isbn=3-8274-1586-1}}</ref> In the Rotliegend era the region formed the crest of a mountain range where the debris originated that was deposited in the Eisenach trough and the northwestern part of the Oberhof trough.

The sedimentary, volcano-sedimentary, and magmatic rocks which were deposited or formed in the area from the Cambrian until the upper [[Devonian]] were subjected to intense [[Metamorphism|metamorphosis]] during the Variscan uplift and are now mostly present in the form of [[gneiss]] or [[schist]].<ref name="ZehExFu">{{cite book | author = Armin Zeh | title = Exkursionsführer in das Kyffhäuser Kristallin und Ruhlaer Kristallin | year = 2005 | pages = 44 | url = http://www.mineralogie.uni-frankfurt.de/petrologie-geochemie/mitarbeiter/zeh/downloads/exkursionsfuehrerhighquality.pdf }}{{Dead link|date=June 2018 |bot=InternetArchiveBot |fix-attempted=no }}</ref>