阿立补注:
金扇玉郎在《江南同乡》坛询问大圆石如何形成的?确实需要补充说明一下。
这是新西兰旅游网(100% Pure New Zealand)的介绍:
“Moeraki is now most famous for its boulders; mysteriously spherical stones scattered across a beach. Each boulder weighs several tonnes and is up to two metres high.Scientists explain the boulders as calcite concretions formed about 65 million years ago. According to Maori legend, the boulders are gourds washed ashore from the great voyaging canoe Araiteuru when it was wrecked upon landfall in New Zealand hundreds of years ago(摩拉基现在最出名的是它的巨石,这些神秘的球形石头散布在海滩各处。每块巨石重达数吨,高达两米。科学家将这些巨石解释为方解石结核,形成于约 6500 万年前。根据毛利人的传说,这些巨石是几百年前,巨大的航行独木舟 Araiteuru 在新西兰登陆时失事,被冲上岸的葫芦)”
方解石(calcite concretions)亦称碳酸钙结核(calcium carbonate concretions),它们通常沉淀在化石物质的核心周围,包括植物物质、贝壳甚至鱼类残骸。