 Significant findings at Arikamedu indlcude numerous Indo @-@ Pacific beads , which facilitated fixing the period of its origin . Red and black ceramics — known as megalithic stones or Pandukal in Tamil meaning " old stones " and used to mark graves — have existed at the site even prior to and during Roman occupation of the site , and also in later periods . 
 Significant findings at Arikamedu indlcude numerous Indo @-@ Pacific beads , which facilitated fixing the period of its origin . Red and black ceramics <a href='uninflect' title='1'><mark>—</mark></a> known as megalithic stones or Pandukal in Tamil meaning " old stones " and used to mark graves — <a href='been_done' title='2'><mark>have</mark></a> existed at the site even prior to and during Roman occupation of the site , and also in later periods . 
Significant findings at Arikamedu indlcude numerous Indo @-@ Pacific beads , which facilitated fixing the period of its origin . Red and black ceramics ——ed known as megalithic stones or Pandukal in Tamil meaning " old stones " and used to mark graves — done existed at the site even prior to and durin Roman occupation of the site , and also in later periods .