Paucispecific crustose microsolenid biostromes with a remarkable amount of encrusting algae and adherent foraminifera (about 10 m in extension) colonized the outer platform margin . In places they are replaced by microsolenid-dominated patch reefs of biohermal character (up to 7 m in diameter) built by crustose and ramose coral morphotypes.
The coral bioherms are overlain by requieniid rudist beds in micritic matrix.
Upper reef of ref. 2412 and 2554