Holmul, Group I mask Published August 17, 2013 at 3900 × 2616 in Holmul, Group I mask ← Previous Next → Archaeologist Anya Shetler (BU, 2012) poses with a newly found monumental mask deeply buried within Building D of Group I at Holmul. Late Preclassic Period (400 BC-AD 200). Photo by Francisco Estrada Belli, July 2013.