ic ▁Period , ▁in ▁what ▁is ▁now ▁Germany . ▁Pro com ps ogn ath us ▁was ▁a ▁small - s ized , ▁light ly ▁built , ▁ground - d well ing , ▁b ip ed al ▁car n iv ore , ▁that ▁could ▁grow ▁up ▁to ▁ 1   m ▁( 3 . 3   ft ) ▁long . ▁ ▁Disc overy ▁and ▁naming ▁The ▁fragment ary ▁and ▁poor ly ▁preserved ▁ske leton ▁of ▁Pro com ps ogn ath us ▁was ▁found ▁in ▁the ▁Middle ▁St ub ens and stein ▁member ▁of ▁the ▁Lö wen stein ▁Form ation ▁at ▁the ▁Wei ße ▁Stein bru ch , ▁the ▁quar ry ▁of ▁Albert ▁B urr er ▁on ▁the ▁northern ▁s lop es ▁of ▁the ▁St rom berg ▁region ▁near ▁Pf affen heim ▁in ▁Wür ttemberg , ▁Germany . ▁The ▁discovery ▁was ▁made ▁by ▁Albert ▁B urr er ▁in ▁the ▁spring ▁of ▁ 1 9 0 9 ▁in ▁white ▁sand stone ▁and ▁gray / blue ▁mar l ▁sed iments ▁that ▁were ▁depos ited ▁during ▁the ▁Nor ian ▁stage ▁of ▁the ▁Tri ass ic ▁period , ▁approximately ▁ 2 1 0 ▁million ▁years ▁ago . ▁ ▁The ▁hol ot ype ▁SM NS ▁ 1 2 5 9 1 , ▁consisted ▁of ▁three ▁blocks ▁of ▁sand stone : ▁one ▁showed ▁a ▁small , ▁seven - cent imet re - long , ▁sever ely ▁cr ushed ▁sk ull ▁with ▁lower ▁j aws . ▁The ▁second ▁and ▁third ▁contained ▁the ▁partly ▁art ic ulated ▁remains ▁of ▁a ▁post c ran