 Reef belt through whole Slovenia. Extending to Italy and Croatia-Albania.
Reef mainly composed of corals and hydrozoans. Well zoned. Fore reef with pelagic marls and limestones, back reef with muddy facies.
Central reef zone some 15 km wide.
with two facies zones:
- Parastromatoporid zone (back reef side)
- Actinostromiid zone (seaward)