1975年冬,在美国加里福尼亚州近海发现了两起用石头制成的古代船锚(简称石锚)。一起是潜水员在帕洛斯·维德斯半岛浅海底发现。它们的形状有:圆柱形(图1a)、斧形(图1c)、扁方形(图1d)和扁三角形(图1e)等。它们的中央都有一中央孔。以圆柱形者为例,高度为50厘米,中央孔直径为20厘米;另一起是在梅迪西诺岬海域近1000(口寻)的水下,由美国地质调查所“先锋号”打捞船获得。有圆柱形(图1b)和图饼形(1f),各穿有直径11厘米和6厘米的孔,圆柱形者高度为65厘米,并且石锚表面有一层厚1.5—3毫米的锰质层。 In the winter of 1975, two ancient anchors made of stone (stone anchors) were found off the coast of California, the United States. Together they were found on the shallow bottom of the Palos Verdes Peninsula. Their shapes are cylindrical (Figure 1a), ax (Figure 1c), flat (Figure 1d) and flat triangular (Figure 1e) and so on. There is a central hole in their center. In the case of a cylindrical one, the height is 50 cm and the center hole is 20 cm in diameter. The other is a submarine nearly 1,000 (mouth-seeking) underwater in the area of ​​Medivhino promontory. obtain. There are cylindrical (Figure 1b) and pie-shaped (1f), each wearing a hole 11 cm and 6 cm in diameter, the height of the cylindrical 65 cm, and the stone anchor surface layer of 1.5-3 mm thick manganese layer .