▁smaller ▁units , ▁the ▁X ing ez hu ang ▁and ▁Hong tu ya ▁Form ations . ▁De pos its ▁in ▁the ▁X ing ez hu ang ▁Form ation ▁consist ▁of ▁multi - color ed ▁cl astic ▁rocks ▁formed ▁from ▁s ilt stone , ▁sand stone , ▁and ▁grey - color ed ▁cl ay , ▁while ▁depos its ▁in ▁the ▁Hong tu ya ▁Form ation ▁consist ▁of ▁red ▁inter f ing ering ▁layers ▁of ▁sand stone ▁and ▁con gl omer ate , ▁c apped ▁at ▁the ▁top ▁by ▁a ▁bas alt ▁layer . ▁The ▁boundary ▁between ▁the ▁two ▁is ▁formed ▁by ▁sand y ▁con gl omer ate ▁and ▁sand stone ▁depos its ; ▁Z J Z - 5 7 ▁origin ates ▁from ▁this ▁boundary . ▁ ▁In ▁ 2 0 1 7 , ▁Z J Z - 5 7 ▁was ▁described ▁by ▁Mo ▁J iny ou , ▁Wang ▁K eb ai , ▁Chen ▁Sh u q ing , ▁Wang ▁Pe i ye , ▁and ▁X u ▁X ing ▁in ▁a ▁research ▁paper ▁published ▁in ▁the ▁Ge ological ▁Bul letin ▁of ▁China . ▁They ▁named ▁it ▁as ▁a ▁new ▁genus ▁and ▁species ▁of ▁tit an osa ur ian ▁sau rop od ▁Zh uch eng t itan ▁z ang j ia z hu ang ensis ; ▁the ▁genus ▁name ▁Zh uch eng t itan ▁comb ines ▁Zh uch eng ▁with ▁the ▁Greek ▁suffix ▁tit an ▁(" t itan ", ▁for ▁" t itan osa ur "), ▁while ▁z ang j ia z hu ang ensis ▁refers