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Il Giura, 152 milioni di anni fa, era popolato anche da dinosauri carnivori. E' quanto ritengono i paleontologi, che hanno scoperto altre impronte, tra le più grandi finora individuate al mondo, sull'altopiano di Courtedoux, nelle vicinanze di Porrentruy. I tridattili che le hanno lasciate dovevano essere alti una dozzina di metri e assomigliare al tyrannosaurus rex, che visse in epoca più recente.
Il fatto che le tracce siano rare corrobora l'ipotesi che siano di predatori collocati in cima alla catena alimentare. Le più significative sono venute alla luce durante gli scavi per la realizzazione dell'autostrada e ne sono stati ricavati dei calchi.
Alla ricerca, i cui risultati sono stati pubblicati dalla rivista Historical Biology, hanno collaborato esperti delle Università di Barcellona e di Denver e del Museo di storia naturale di Basilea.
ATS/dg
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