(S (S (BASENP (DT These) (NNS shoes)) (VP (VP (VBD were) (VP (VBN discovered) (PP (IN in) (BASENP (NN 1938))))) (CONJP (COMMA ,) (CC and)) (VP (VBP have) (VP (VBN been) (VP (VBN dated) (PP (TO to) (NP (BASENP (QP (RB about) (NN 10,000)) (NNS years)) (PP (IN before) (BASENP (NN present)))))))))) (PERIOD .))