underlying rock的用法和樣例：
例句
- The mother rock derived form Archaean and Early Proterozoic metamorphic rock from the north-east part of Ordos Basin.
該區延長組母巖主要來自盆地東北緣的太古代及早元古代變質巖。 - Once formed, zircon crystals are so durable that they can persist even if their parent rock is exposed at the surface and destroyed by weathering and erosion.
但是，這些鋯石所蘊含的訊息似乎隱晦不清，部份原因是地質學家無法確定它們的母巖。
