, ▁are ▁the ▁subject ▁of ▁some ▁controvers y ▁in ▁Northern ▁Gu atem ala . ▁NASA ▁Sh utt le ▁Rad ar ▁Top ography ▁Mission ▁( S RT M ) ▁data ▁indicate ▁no ▁de pression ▁in ▁the ▁area . ▁ ▁During ▁the ▁past ▁two ▁dec ades , ▁the ▁region ▁has ▁been ▁ ▁the ▁object ▁of ▁arch ae ological ▁investig ations ▁at ▁the ▁large ▁Middle ▁and ▁Late ▁Pre class ic ▁sites ▁of ▁El ▁Mir ador , ▁ ▁Nak be , ▁El ▁T int al , ▁W ak na , ▁the ▁recently ▁discovered ▁sites ▁of ▁X ul nal ▁and ▁El ▁P es qu ero , ▁and ▁numerous ▁smaller ▁settlement s , ▁d ating ▁mostly ▁to ▁the ▁Classic ▁period , ▁such ▁as ▁La ▁Florida , ▁Ma ax te , ▁Z ac atal , ▁Chan ▁Kan , ▁Ts ab ▁Kan , ▁Ped ernal , ▁ ▁Is la , ▁La ▁Mu erta , ▁and ▁La ▁M ural la . ▁ ▁Do z ens ▁of ▁additional ▁sites ▁are ▁dispers ed ▁within ▁the ▁Bas in , ▁including ▁several ▁extremely ▁large ▁ones ▁such ▁as ▁Na acht un ▁in ▁the ▁n ortheast ▁corner ▁which ▁is ▁currently ▁under ▁investigation ▁by ▁a ▁team ▁from ▁the ▁University ▁of ▁Cal g ary ▁in ▁Canada ▁( Direct or : ▁Kath ry n ▁Re ese - T aylor ). ▁ ▁The ▁primary ▁settlement ▁of ▁the ▁major ▁ ▁sites ▁in ▁the ▁bas in ▁dates ▁to ▁the ▁Middle ▁Pre class ic ▁( ca . ▁ 1 0 0 0 ▁B CE ▁- ▁ 3 5 0 ▁B CE ) ▁and ▁Late ▁Pre