Biormaiza buildup and Lizarraga
complex. Da-2 sequence (NP3-NP4).
This complex is up to 150 m thick and creates the prominent platform rim that typifies this upper Danian sequence. It is formed by 11 major reefal constructions and several minor
ones clustered in a 10 km long reef tract, which
originally stretched continuously between the S. Adrian chapel and Pen~a Blanca sections.
Reef core of scleractinians and solenoporaceans. Many corallinaceans and  peysonelliaceans as encrusters, some encrusting foraminifers.