叠层石是世界上已知的最古老化石。组成这些石头的这种微小的藻类或细菌也被认为是最古老的生命形式，在超过三十亿年后的今天仍然存在。
The tiny algae or bacteria that build them are also thought to be the most ancient life form that is still around today, after more than three billion years.
形成叠层石的蓝绿色藻类通过分解二氧化碳和排出氧气，从而有助于创造出我们目前的大气层。
The blue-green algae that form the stromatolites helped create our present atmosphere by breaking down carbon dioxide and excreting oxygen.
应用推荐