36 + 6 m thick structures superimposed in Oligocene barrier reef tract, separated by peat bed.
Camino Carretero Member of La Quinta Fm.
27 coral species described.
Algae not described
Dominant genera
Diploastrea
Atiguastrea
Alveopora
Agathiphyllia
Colpopyllia
Favites
Porites

Strongly zoned: algal-Eulepidina shoal at base - branching coral bed - Porites bank - zone with massive corals