Plexodictyon irregulare community of Nestor (1999).
P. irregulare, Plectostroma scaniense, Stromatopora clarkei, Parallelopora ornata, Densastroma cf. sociale, Parallelostroma typicum, Lophiostroma schmidti and Ecclimadictyon aff. robustum.
Extension of reef belt to Lithuania.
Reef interval from 420-458.3 m in Ventspils drill core.