Dinocochlea
... that Dinocochlea was thought to be a giant snail shell or fossilised dinosaur dung but is actually a solidified worm's burrow?
... that <b id="mwEaI"><a href="./Dinocochlea" id="mwEaM" rel="mw:WikiLink" title="Dinocochlea">Dinocochlea</a></b> was thought to be a giant <a href="./Gastropod_shell" id="mwEaQ" rel="mw:WikiLink" title="Gastropod shell">snail shell</a> or <a href="./Coprolite" id="mwEaU" rel="mw:WikiLink" title="Coprolite">fossilised dinosaur dung</a> but is actually a <a href="./Concretion" id="mwEaY" rel="mw:WikiLink" title="Concretion">solidified</a> worm's burrow?