Paleontologists say a 201-million-year-old dinosaur fossil found two years ago on a Welsh beach could offer vital clues to understanding the evolution from the late Triassic to the early Jurassic Period.br clear='all'/img width='1' height='1' src='http://reuters.us.feedsportal.com/c/35217/f/654220/s/4d7082d0/sc/32/mf.gif' border='0'/div class="feedflare"
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