the partial skull resembles that of "parasaurolophus" from north america. this does "not" suggest a bering land bridge existed during the cretaceous period, since at that time north america was far away from eastern asia. instead, it is likely that this group of hadrosaurs all had a similar long, backward-projecting hollow crest. it may have been used for trumpeting their calls. in other words, their skull shape was a basal feature.