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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.
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.
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]
Schwerte is situated in the Ruhr valley, at the south-east border of the Ruhr Area. South of Schwerte begins the mountainous Sauerland region. Division of the town
The city lies on both sides of the Rhine, with the city centre and most boroughs on the river's right bank, and is the only city of the Rhine-Ruhr region lying on both the Rhine and Ruhr rivers. Duisburg is one of the largest cities in the Meuse-Rhenish (closely related to Dutch ) dialect area and the largest in the Kleverlandish area (north of ...
The occupation of the Ruhr (German: Ruhrbesetzung) was the period from 11 January 1923 to 25 August 1925 when French and Belgian troops occupied the Ruhr region of Weimar Republic Germany. The occupation of the heavily industrialized Ruhr district came in response to Germany's repeated defaults on the reparations payments required under the ...
The Rhine-Ruhr metropolitan region (German: Metropolregion Rhein-Ruhr) is the largest metropolitan region in Germany, with over ten million inhabitants. [2] A polycentric conurbation with several major urban concentrations, the region covers an area of 7,110 square kilometres (2,750 sq mi), entirely within the federal state of North Rhine-Westphalia.