ate ▁and ▁py rite ▁nod ules . ▁ ▁Am mon ite ▁foss ils ▁such ▁as ▁Alt ud oc eras , ▁Sh ouch ang doc eras ▁are ▁there , ▁and ▁Hay den ella ▁a ▁bra ch ip od ▁is ▁also ▁found . ▁The ▁T ong zi yan ▁Form ation ▁has ▁sand stone , ▁s ilt stone ▁and ▁mud stone . ▁The ▁upper ▁Perm ian ▁Cu ip ing sh an ▁Form ation ▁has ▁thin ▁b eds ▁of ▁sand stone ▁and ▁s ilt stone ▁and ▁coal . ▁ ▁The ▁Dal ong ▁Form ation ▁has ▁mud stone ▁with ▁lim estone ▁l enses ▁in ▁the ▁west . ▁ ▁The ▁Ch ang x ing ▁formation ▁is ▁primarily ▁lim estone . ▁ ▁Tri ass ic ▁The ▁Tri ass ic ▁contains ▁X ik ou , ▁X i wei , ▁An ren ▁Dak eng ▁Form ations ▁followed ▁by ▁a ▁partial ▁un con form ity , ▁then ▁W en bin sh an , ▁and ▁J ia ok eng ▁Form ation ▁containing ▁con gl omer ate . ▁ ▁The ▁X ik ou ▁Form ation ▁in ▁South west ▁F uj ian , ▁consists ▁of ▁a ▁fine ▁gra ined ▁tur bid ite . ▁ ▁In ▁the ▁areas ▁near ▁Long yan ▁Y ong ding ▁and ▁Z hang ping ▁there ▁are ▁large ▁blocks ▁of ▁o olit ic ▁lim estone ▁embedded . ▁ ▁Jur ass ic ▁The ▁L ish an ▁formation ▁contains ▁sand stone ▁and ▁some ▁acid ▁vol can ic ▁particles . ▁The ▁Z hang ping ▁formation ▁is ▁mostly ▁pur ple ▁red ▁s ilt stone . ▁The ▁Ch ang