而熔岩沉积物又使一些地方火山岩岩层厚达20米(65英尺)。
Subsequent lava flows deposited volcanic rocks up to 20 meters (65 feet) thick in some places.
对含有化石的厚岩层的详细现场研究为相互竞争的理论提供了最佳的潜在检验。
Detailed field studies of thick rock formations containing fossils provide the best potential tests of the competing theories.
钻探头穿过3000米厚的岩层将会触碰到2140米厚的盐层。
Drill past 3, 000 metres of rock and you will hit a layer of salt 2, 140m thick.
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