650 m thick reefal complex with coral-stromatoporoid patch reefs, stromatoporoid-Lithocodium patch reefs, packstones, grainstones, calcareous sponges, Tubiphytes and foraminifera.
Age poorly constrained between late Kimmeridgian and Berriasian. Bulk of reef is probably Tithonian. Two reefs added to give double weight to Tithonian.