Percolating into empty cracks and cavities, such as those found in breccias, it creates flowstones.

渗透到的裂腔中，例如角砾岩中发的裂腔，它会产生流。

The team now reckon the Member 4 breccia formed between 3.4m and 3.6m years ago, over a million years earlier than believed.

该团估计 Member 4 角砾岩形成于 340 万至 360 万年前，比人们认为的早了 100 万年以上。

Using this method Dr Granger and colleagues determined, in 2015, that the breccia in Member 2 is 3.7m years old—1.5m years more ancient than originally thought.

使用这种方法，Granger 博士及其同事 2015 年确定，成员 2 中的角砾岩有 370 万年的历史——比最初认为的要古老 150 万年。