Middle to late Asselian. 
26 reef mounds aligned in belt.
Thickness 50-130 m, 50-500 wide
Reefs on argillareceous limestones and dolostones.
No Palaeoaplysina in either of these reefs!
Frodo buildup: 
- Bryozoan-Tubiphytes-stromatactis boundstone
- bryozoan cementstone
- byrozoan wackestone
- algal boundstone