 Among other sculpted and engraved materials are flint, shell, and bone, often found in caches and burials.The so-called 'eccentric flints' are ceremonial objects of uncertain use, in their most elaborate forms of elongated shape with usually various heads extending on one or both sides, sometimes those of the lightning deity, but more often of an anthropomorphic lightning probably representing the Tonsured Maize God.Shell was worked into disks and other decorative elements showing human, possibly ancestral heads and deities; conch trumpets were similarly decorated.