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Sigillara specimen (bark removed), found in the Nordstern mine, Flöz Zollverein 2/3 at a depth of 1000m.. During the Carboniferous Period, in the Paleozoic era, which began 360 million years ago and ended 300 million years ago, layers of slate, coal and sandstone were formed. 400 to 300 million years ago, new mountains were uplifted during the Variscan mountain-building period.
The 1911 edition of Encyclopædia Britannica has only one definition of "Ruhr": "a river of Germany, an important right-bank tributary of the lower Rhine". The use of the term "Ruhr" for the industrial region started in Britain only after World War I, when French and Belgian troops had occupied the Ruhr district and seized its prime industrial assets in lieu of unpaid reparations in 1923.
The Ruhr is a metropolitan region in North Rhine-Westphalia, Germany. ... History of the Ruhr; I. Industrial Heritage Trail; Internationale Bauausstellung Emscher Park; K
The Ruhr Question was a political topos put on the agenda by the Allies of World War I and the Allies of World War II in the negotiations following each respective war, concerning how to deal with the economic and technological potential of the area where the Rhine and Ruhr intersect.
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The 12-meter level represents the region's pre-industrial memory and also includes the museum's collections on archeology, ethnology and natural history. On the 6 meter level the history of the Ruhr area in the industrial age is represented. Thus the museum is not only an industry museum, but presents a trias of nature, culture and history. [2]
Then the river marks the southern limit of the Ruhr area, passing Hagen, Dortmund, Herdecke, Wetter, Witten, Bochum, Hattingen, Essen, Mülheim, and Duisburg. The Ruhr area was Germany's primary industrial area during the early- to mid-20th century. Most factories were located there.
Memorial to the Ruhr uprising in Hagen. On 5 April a large part of the Red Ruhr Army fled to the French occupied zone of the Rhineland. [10] The skirmish that took place in Gelsenkirchen the next day marked the final end of the uprising and of the Red Ruhr Army. [11] The number of insurgents killed has never been accurately determined.