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A ''Jura hole stone'' (or ''Jura Coral rock'', or ''Jura cavity stone'') is a natural stone found in the Jura mountains of France. They are with light beige coloring and many cavities. They come from the petrified sea deposits that were cause by tectonic shifts between mountains. The bizarre form and many cavities are caused by natural erosion over thousands of years. These stones are protected : it is forbidden to pick them up. However, some are for sale for aquarium decoration. == Gallery == File:Pierre à trous du Jura 1.jpg File:Pierre à trous du Jura 3.jpg 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Jura hole stone」の詳細全文を読む スポンサード リンク
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