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      The unconsolidated sediments are deposits which were formed by secondary sedimentation of previously weathered rocks and redeposition of their fragments, and/or by chemical and biochemical precipitation from solutions. They were not compacted and lithified. Unconsolidated sediments are mostly of Tertiary and Quaternary ages. However, there are some exceptions, as the Cambrian blue clays of St. Petersboug with their important fossils (gastropods, hyolithids, spores).

písek slévárenský

No. of sample:	g5217
Rock:	písek, sedimenty nezpevněné
Description:	jedna krabička
Localization:	Maršovice u Bohusudov
Author:	leg.Vachtl,1950
Comment:	oligocen obecní pískovna, svrchní poloha

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