Contact

Markt Hengersberg

Mimminger Str. 2
94491 Hengersberg

 

phone: 0049 9901/9307-0
fax: 0049 9901/9307-40

 

mail: markt@hengersberg.de

web: www.hengersberg.de

 

Opening Hours

Mon. bis Fri.   08.00 - 11.45 Uhr
Thu. 14.00 - 16.00 Uhr
Thr. 14.00 - 18.00 Uhr

 

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Brown Coal Mine

Lignite (Brown Coal) Mine in Schwanenkirchen

Braunkohlebergbau

How did the lignite evolve?

 

There are tertiary deposits on the southwestern slopes of the Bavarian Forest and in the Danube Valley from Regensburg to Passau. About 60 million years ago while the Alps were forming at the period of transition from the Mesozoic to Cenozoic ages of the earth, the ground below the level of the present Danube Valley gradually sank.   This included the vegetation at that time (plants, alder trees and bald cypress trees and other Mesozoic tree forms), which became covered by ocean water when the area of the Black Sea twice flooded the low areas where the Danube now is.

 

At the end of the new Cenozoic age the ocean gradually decayed  by filling up with settling sediment.  The rivers flowing out of the Bavarian Forest and the Alps brought water that transported incredible amounts of rock and stone (especially the River Isar), which covered everything with sand, mud and gravel  and thereby, filled up the sea.

Braunkohlebergbau

The lignite (and  the surrounding sedimentation) belong to the field of molasse.  In the area of Schwanenkirchen, sedimentation occurred around 18 to 12,8 million years ago,  and the lignite was formed out of this underlying organic material.  Unfortunately, there has not been an exact examination of the organic content of the Schwanenkirchen brown coal (paleo-botanical),  which would allow for more exact dating.