silicified tuff

英 美
  • 硅化凝灰岩
    1. This kind of rock is called tuff.
      这里的岩质是凝灰岩。
    2. Over the tuff, a thinner layer of harder volcanic rock, like basalt, formed from lava flows.
      在凝灰岩,更薄一层难以火山岩,如玄武岩,形成由熔岩流。