File:Kalktuff-Block Schloss-Tuebingen 2.jpg

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Deutsch: Alter Steinquader aus versteinertem Kalktuff, vermutlich aus einem Steinbruch von Gönningen oder Honau, beide am Albtrauf; 1606 verbaut an der Schlosstor-Bastei des Schlosses Hohen Tübingen.
Diese Sedimentgesteine sind extrem hart und witterungsbeständig. Bei der Ablagerung umschlossene biotische- und abiotische „Verunreinigungen" machen das Gestein porös und leicht.
English: Old stone of petrified Kalktuff („Calcarious Tuff") equiv. Travertine, from a near quarry at the Albtrauf. Image shows part of one of the bastions of the castle Hohen Tübingen, which was built in 1606 with this material.
The petrified material is extremely hard and weatherproof. The well visable cavities and impurities - remnents of small debris, scrub and biotic materials - make the sedimentary rock Travertine porous and thus lightweight.
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current00:50, 1 February 2008Thumbnail for version as of 00:50, 1 February 20081,800 × 1,200 (2.72 MB)Ustill (talk | contribs)|Description= {{de|Alter Steinquader aus versteinertem Kalktuff, vermutlich aus einem Steinbruch von Gönningen oder Honau, beide am Albtrauf; 1606 verbaut an der Schlosstor

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