thanks tia for the info.
i think i get the gist of it,though blinded by the tech details.
if i got this sort of right;blood residues which should not be observable 65 mill yrs later,non-the-less are,but because the usually accepted dating methods inform evolutionary scientists that the encasing and covering rocks are at least 65 mill yrs old therefore the dinos are!
am i missing something?.
if this has been resolved,if only theoretically,iam interested to know.
best wishes
pete