Nor were they able to come up with an explanation for another enigma. This was the deliberate burial, along specific alignments, of five of the massive pieces of sculpture, showing negroid features, now widely identified as ‘Olmec heads’. These peculiar and apparently ritualistic graves also yielded more than sixty precious objects and artefacts, including beautiful instruments made of jade and exquisitely carved statuettes. Some of the statuettes had been systematically mutilated before burial.
