Coral biostrome (1.7 m thick) interbedded between two oyster shell beds. Only one coral species identifed, but one oyster and bryozoan species also indicated.
The biostrome is laterally continuous for more than 600m.
The studied section belongs to the upper half of the Pilmatué. The coral bed is interpreted as a coral biostrome. It is composed by low ramose coral colonies that did not form a rigid barrier, lacking lateral coalescence and overgrowing.