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 are described; algae are not described. Dominant genera are: Diploastrea, Atiguastrea, Alveopora, Agathiphyllia, Colpopyllia, Favites, Porites. Strongly zoned: algal-Eulepidina shoal at base, branching coral bed, Porites bank, zone with massive corals.