4.5 m thick silicified coral biostrome.

Abstract of ref. 1279:
During the Hauterivian-Barremian, local coral biostromes, possibly patch reefs, developed within shallow marine lagoons fringing Early Cretaceous volcanoes in Peru. The dominant coral is S. columbaris sp. nov. which is similar to European stylinid species of Late Jurassic and Early Cretaceous age having 6-fold septal plans. The biostrome is part of the Atocongo Formation, Lima Group, exposed at Perico Hill (Cerros Perico) about 95 km south of Lima. Only 2 other lower Cretaceous stylinid corals were described from South America. 