Individual #Cretaceous_period__Cretaceous  from 63 million to 135 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants
  instance of:  geological_period
  part of:  Mesozoic_era__Mesozoic__Age_of_Reptiles  from 63 million to 230 million years ago

No statement uses or specializes Cretaceous_period; click here to add one.