0145709 - GLU-S 20033080 RIV CZ eng J - Journal Article
Mikuláš, Radek
Ichnological aspect of fossiliferous nodules of the Šárka Formation (Ordovician, llanvirnian, Czech Republic).
Věstník Českého geologického ústavu = Bulletin of the Czech Geological Survey, Prague. Roč. 78, č. 1 (2003), s. 13-18. ISSN 1210-3527
Grant - others:UNESCO(XX) IGCP:410
Institutional research plan: CEZ:AV0Z3013912
Keywords : Ordovician * Llanvirnian * ichnofossils
Subject RIV: DB - Geology ; Mineralogy
Result website:
http://www.geology.cz/bulletin/contents/2003/vol78no1/08-mikulas.pdf

In the muddy, oxygen-deficient sediments of the Llanvirnian of the Prague Basin, chemical disequilibrium between burrows and the host substrate were a common reason for the origin of nodules. As the ichnofossils are well preserved in the nodules, without deformation, the origin of the nodules during very early diagenesis is likely, in some cases possibly contemporaneous with the existence of the burrow. The steepest chemical gradient can be expected close to the openings of the burrows. Therefore, these parts of burrows may have had the highest fossilization potential. The ichnogenera of Skolithos, Planolites, Rhizocorallium and Glockerichnus were recognized as possible agents of the nodule-forming process.
Permanent Link: http://hdl.handle.net/11104/0043267