petrogypsic horizon

例句：

1. 1.The petroglyphs on the cave walls are a testament to the ancient civilization's artistic abilities.
   洞穴墙壁上的岩画是古代文明艺术能力的见证。
2. 2.The geologist is studying the petroglyphs in hopes of finding more information about the region's history.
   地质学家正在研究岩画，希望能找到更多关于该地区历史的信息。
3. 3. The stratigraphy of the area shows that the rocks were deposited over millions of years.
   该地区的地层学显示，这些岩石是在数百万年中沉积起来的。