▁as ▁its ▁better - develop ed ▁del to pect oral ▁cr est . ▁It ▁cannot ▁be ▁compared ▁with ▁other ▁gener a ▁that ▁lack ▁preserved ▁hum eri . ▁ ▁Pale o ec ology ▁ ▁The ▁depos its ▁from ▁which ▁Zh uch eng t itan ▁origin ated ▁are ▁characteristic ▁of ▁all uv ial ▁fans , ▁bra ided ▁rivers , ▁and ▁flo od pla ins . ▁Based ▁on ▁arg on - arg on ▁d ating ▁of ▁the ▁bas alt ▁layer ▁at ▁its ▁top ▁end , ▁the ▁Hong tu ya ▁Member ▁at ▁Z ang j ia z hu ang ▁has ▁been ▁estimated ▁at ▁approximately ▁ 7 3 . 5 ▁Ma ▁in ▁age , ▁which ▁places ▁it ▁during ▁the ▁Camp an ian ▁epo ch ▁of ▁the ▁C ret ace ous ▁period . ▁Other ▁din osa urs ▁found ▁at ▁Z ang j ia z hu ang ▁include ▁the ▁had ros aur id ▁orn ith op od ▁Sh ant ung osa urus ▁gig ante us ▁( re ferred ▁to ▁by ▁Mo ▁and ▁colle agues ▁as ▁" H u ax ias aur us ▁maxim us "), ▁the ▁ty ran n osa ur id ▁ther op od ▁Zh uch eng ty ran n us ▁magn us , ▁and ▁the ▁cer at ops id ▁Sin oc er at ops ▁z h uch eng ensis . ▁Din osa ur ▁foss ils ▁at ▁Z ang j ia z hu ang ▁generally ▁only ▁consist ▁of ▁a ▁few ▁spec im ens ▁except ▁for ▁the ▁thousands ▁of ▁Sh ant ung osa urus ▁spec im ens ▁that ▁are ▁known