Deformation bands in Berlin

Deformation bands in the Nebra Sst at the Alte Nationalgalerie in Berlin. The bands are dipping gently to the right.

Deformation bands in the Nebra Sst at the Alte Nationalgalerie in Berlin. The bands are dipping gently to the right, but assuming bedding was horizontal suggests that they are actually very steep reverse structures.

Berlin is not exactly known for its outcrops of rocks, but has lots of impressive buildings made of rocks that may be interesting. Sandstone is well represented, and a nice sandstone caught my attention at a recent visit to the Museumsinsel in Berlin. It is the Nebraer Sandstein (Nebra Sandstone) used in Die Alte Nationalgallerie, which is full of nice fluvial(?) sedimentary structures.

The picture shows deformation bands affectingbut not discretely disrupting the lamination. Hence the bands are small shear zones, probably formed by granular (non-cataclastic) flow before the sandstone was very well lithified. Disaggregation bands is a term often used about these structures.

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About Haakon Fossen

Professor of structural geology, University of Bergen. Author of book Structural Geology, published at Cambridge University Press
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