Journal of

GEOsciences

  (Formerly Journal of the Czech Geological Society)

Original Paper

Žítt, Nekvasilová

Octocoral encrusters of rock substrates in the Upper Cretaceous of Bohemia

Journal of the Czech Geological Society, volume 38 (1993), issue 1-2, 71 - 78

Four morphological types of octocoral bases are described from the nearshore upper Cenomanian-lower Turonian sequences of Bohemia (Kaňk and Skuteč Members of Korycany Formation, and basal parts of Bílá Hora Formation). All the bases studied still adhered either to the rock clasts or to the rocky bottom and their low number shows that the octocorals were a rare component of encrusting communities. Relations of these communities to the environmental change marked by phosphatization processes is briefly discussed. A great majority of studied octocorals formed a part of Atreta-Bdelloidina community, flourishing mainly during the post-phosphatization period.