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通过对加利福尼亚海岸出水石锚的岩石学和古生物学的研究，初步推断了其原岩的产地，并用１４Ｃ同位素测年测定了保存于石锚内的现代贝壳的年龄，由此大致推断出石锚的入水年龄。以上研究结果表明：（１）这些石锚石料非采自美洲本土，就世界范围而言，其产地分布于环太平洋的新阿尔卑斯皱褶带内，包括日本、台湾、马来西亚、印度尼西亚及中东、西亚乃至地中海沿岸地区；（２）这些石锚至少在１５００年前就已落入海中，也就是说这些石锚的主人要比哥仑布发现美洲新大陆早１０００余年。
Based on the petrology and palaeontology of the outcrop of anchors in the coast of California, the origins of the original rocks were preliminarily estimated and the ages of the modern shells preserved in the anchors were determined by 14C isotope dating. Thus, Into the water age. The above findings show that: (1) These stone anchors are non-native to the Americas and, in the world, their origin lies in the New Alpine fold belt of the Pacific Rim, including Japan, Taiwan, Malaysia, Indonesia and the Middle East, West Asia And the Mediterranean coast; and (2) these rock anchors have fallen into the sea at least 1500 years ago, meaning that the masters of these rock anchors were found over 1000 years earlier than Columbum in the New World.