▁a ▁direct ▁P ip il ▁presence , ▁jud ging ▁by ▁the ▁level ▁of ▁evidence . ▁ ▁After ▁ 1 2 0 0 , ▁T az um al ▁was ▁largely ▁abandoned , ▁with ▁occupation ▁sh ifting ▁west wards ▁towards ▁the ▁centre ▁of ▁what ▁is ▁now ▁the ▁modern ▁town ▁of ▁Chal ch u apa . ▁Chal ch u apa ▁was ▁still ▁occupied ▁at ▁the ▁time ▁of ▁the ▁Spanish ▁con quest , ▁at ▁which ▁time ▁its ▁inhabitants ▁were ▁Po q om am ▁May a . ▁The ▁Pok om am ▁are ▁believed ▁to ▁have ▁been ▁relatively ▁late ▁sett lers ▁in ▁Chal ch u apa , ▁post dating ▁the ▁P ip il ▁influence ▁that ▁last ed ▁until ▁ 1 2 0 0 . ▁ ▁Between ▁ 1 9 4 2 ▁and ▁ 1 9 4 4 ▁Stanley ▁Bog gs ▁exc av ated ▁and ▁restored ▁structures ▁B 1 - 1 ▁and ▁B 1 - 2 . ▁This ▁rest oration ▁included ▁co ating ▁the ▁structures ▁with ▁modern ▁c ement , ▁which ▁Bog gs ▁jud ged ▁to ▁be ▁sufficiently ▁similar ▁to ▁their ▁original ▁appearance ▁as ▁to ▁justify ▁its ▁use . ▁Bog gs ' ▁final ▁report ▁was ▁not ▁made ▁generally ▁available ▁and ▁no ▁further ▁arch ae ological ▁investig ations ▁were ▁carried ▁out ▁until ▁the ▁early ▁ 2 1 st ▁century . ▁In ▁ 1 9 4 7 ▁T az um al ▁was ▁declared ▁a ▁National ▁Historic ▁Monument . ▁Until ▁ 2 0 0 1 , ▁the ▁Salvador an ▁ 1 0 0 ▁col ón ▁note ▁carried ▁an ▁illustr ation ▁of ▁the ▁ru