ved ▁beginning ▁ 1 2 5 , 0 0 0 ▁years ▁ago . ▁Rad i oc ar bon ▁d ating ▁of ▁samples ▁in ▁this ▁study ▁suggests ▁the ▁domain ▁between ▁R ames war am ▁and ▁T ala im ann ar ▁may ▁have ▁been ▁exposed ▁som etime ▁between ▁ 7 , 0 0 0 ▁and ▁ 1 8 , 0 0 0 ▁years ▁ago . ▁Th erm ol um ines c ence ▁d ating ▁by ▁G SI ▁con cludes ▁that ▁the ▁sand ▁d unes ▁between ▁D han ush k odi ▁and ▁Adam ' s ▁Bridge ▁started ▁forming ▁about ▁ 5 0 0 – 6 0 0 ▁years ▁ago . ▁ ▁Another ▁study ▁suggests ▁that ▁the ▁appearance ▁of ▁the ▁re ef s ▁and ▁other ▁evidence ▁indicate ▁their ▁rec ency , ▁and ▁a ▁cor al ▁sample ▁gives ▁a ▁radi oc ar bon ▁age ▁of ▁ 4 , 0 2 0 ± 1 6 0 ▁years ▁B P . ▁ ▁Early ▁surve ys ▁and ▁d red ging ▁efforts ▁ ▁Due ▁to ▁shall ow ▁waters , ▁Adam ' s ▁bridge ▁presents ▁a ▁form id able ▁h ind rance ▁to ▁navigation ▁through ▁the ▁P alk ▁Stra it . ▁Though ▁trade ▁across ▁the ▁India - S ri ▁L anka ▁divide ▁has ▁been ▁active ▁since ▁at ▁least ▁the ▁first ▁mill en ni um ▁BC , ▁it ▁was ▁limited ▁to ▁small ▁boats ▁and ▁d ing h ies . ▁Lar ger ▁ocean - going ▁vessels ▁from ▁the ▁West ▁have ▁had ▁to ▁navigate ▁around ▁Sri ▁L anka ▁to ▁reach ▁India ' s ▁eastern ▁coast .