Kallakurichi Formation
The Kallakurichi Formation , alternatively spelled as Kallankurichchi or Kallankurichi Formation , is a geological formation of the Ariyalur Group in Tamil Nadu , southern India whose strata date back to the Maastrichtian stage of the Late Cretaceous . 
<triplet> Kallakurichi Formation <subj> formation <obj> instance of <triplet> Maastrichtian <subj> Late Cretaceous <obj> part of <triplet> Late Cretaceous <subj> Maastrichtian <obj> has part