▁the ▁traditional ist ▁approach . ▁He ▁also ▁produced ▁a ▁large ▁number ▁of ▁rest or ations ▁showing ▁small ▁din osa urs ▁with ▁fe athers , ▁and ▁def ended ▁the ▁idea ▁in ▁a ▁number ▁of ▁articles ▁and ▁his ▁book ▁Pred atory ▁Din osa urs ▁of ▁the ▁World . ▁His ▁view ▁was ▁proven ▁largely ▁correct ▁in ▁the ▁late ▁ 1 9 9 0 s ▁with ▁the ▁discovery ▁of ▁several ▁fe ather ed ▁din osa urs . ▁Paul ' s ▁ideas ▁and ▁style ▁have ▁had ▁a ▁significant ▁impact ▁on ▁din osa ur ▁art , ▁and ▁likely ▁will ▁continue ▁to ▁do ▁so ▁for ▁some ▁time . ▁ ▁New ▁ext inction ▁theories , ▁the ▁meteor ▁impact ▁▁ ▁Trad itionally ▁pale ont ology ▁had ▁followed ▁ge ology ▁in ▁prefer ring ▁uniform itar ian ▁mechan isms , ▁despite ▁the ▁promotion ▁by ▁Eug ene ▁Mer le ▁Sho em aker ▁of ▁the ▁importance ▁of ▁cat ast roph ic ▁impact s . ▁During ▁the ▁r ena issance ▁period ▁Walter ▁Al vare z ▁and ▁others ▁found ▁ir id ium ▁in ▁the ▁C ret ace ous – T ert i ary ▁boundary ▁layer . ▁Also ▁the ▁Ch ic x ul ub ▁Cr ater , ▁was ▁identified ▁and ▁determined ▁to ▁be ▁due ▁to ▁a ▁meteor ▁impact . ▁These ▁discover ies ▁led ▁to ▁the ▁accept ance ▁and ▁popular isation ▁of ▁the ▁idea ▁that ▁the ▁ext inction ▁had ▁been ▁caused ▁by ▁an ▁impact ▁event . ▁This ▁in ▁turn ▁und erm ined ▁the ▁assumption ▁that ▁din osa urs ▁had ▁become ▁ext inct ▁because ▁they ▁were ▁inferior ▁to ▁m amm als