There are several processes by which fossilisation can take place. Not all involve total replacement of the organic material. In any case, the Neanderthal bones used to extract the DNA are relatively young and so can have some fragmentary DNA left.
The occasional 'mummified dinosaur' (I remember there being one found when I was a kid and this search threw up a more recent one- both duck billed dinosaurs interestingly) has soft parts preserved, but they have been replaced by mineral- so no Jurassic Park for you.
http://news.nationalgeographic.com/n...dinomummy.html
I have no doubt that most people in Europe, and a majority in North America and Australia will have ancestors who are considered 'celts' (incidentally, is Keltoi Greek for the people around Massalia or the people of Pannonia?), along with a vast assortment of others, including Attila the Hun, probably. You can't call them all Celtic. Well you can, but that would be meaningless.
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