These (sometimes called the Palos Verdes stones) were initially thought to be up to 1500 years old and proof of pre-Columbian contact by Chinese sailors.
这些石头（有时被叫作帕洛斯弗迪斯石头）最初被认为是早在1500年以前的东西，是哥伦布时代前中国水手与美洲接触的证据。