▁from ▁Complex ▁A , ▁with ▁approximately ▁one ▁hundred ▁years ▁between ▁each ▁phase . ▁Unfortunately , ▁exc av ating ▁Complex ▁A ▁led ▁to ▁the ▁destruction ▁of ▁the ▁original ▁integrity ▁of ▁the ▁site ▁and ▁has ▁made ▁it ▁difficult ▁to ▁go ▁back ▁and ▁re - verify ▁the ▁dates . ▁This ▁is ▁why ▁La ▁V enta ▁has ▁a ▁rather ▁loose ▁chron ology ▁that ▁cannot ▁be ▁made ▁any ▁more ▁definit ive . ▁ ▁Ph ase ▁I — dated ▁with ▁five ▁radi oc ar bon ▁samples ▁( from ▁the ▁strat ig raph y ▁at ▁Complex ▁A ) ▁that ▁have ▁the ▁average ▁age ▁of ▁ 2 7 7 0 ▁ ± ▁ 1 3 4 ▁years ▁old ▁( 8 1 4 ▁B CE ▁+ /- ▁ 1 3 4 ▁years ) ▁ ▁Ph ase ▁II — dated ▁with ▁a ▁single ▁sample ▁at ▁ 8 0 4 ▁B CE ▁ ▁Ph ase ▁III — no ▁radi oc ar bon ▁dates ▁ ▁Ph ase ▁IV — no ▁radi oc ar bon ▁dates , ▁from ▁Post - Ph ase ▁IV ▁dates , ▁He izer ▁and ▁Dru cker ▁estimated ▁the ▁end ▁of ▁Ph ase ▁IV ▁somewhere ▁between ▁ 4 5 0 ▁and ▁ 3 2 5 ▁B CE ▁ ▁Post - Ph ase ▁IV — two ▁samples ▁average ▁ 2 2 6 5 ▁years ▁old ▁( 3 0 9 ▁B CE ) ▁ ▁Con clusion : ▁The ▁La ▁V enta ▁site ▁was ▁used ▁from ▁( appro xim ately ) ▁ 8 0 0 - ▁ 4 0 0 ▁B CE , ▁during ▁the ▁Form