mudstone

[地]泥岩英释中释na dark grey clay rock similar to shale but with the lamination less well developed

1 Rocks sculptured by erosion, richly tinted mudstone hills and canyons, luminous sand dunes, and lush oases populate Death Valley National Park..在死亡谷国家公园里，有着腐蚀而成的岩石雕刻、富有着色泥岩的山丘和峡谷、发光的沙丘和郁郁葱葱的绿洲。

2 Organic materials were deposited in sequences of sandstone and mudstone, which were then covered by limestones as the environment became progressively more marine..无机矿物质按照砂岩和泥岩的顺序沉积着，并随着周围的自然环境演变为海洋性，由石灰石覆盖在了最上层。

3 The tools were located in a series of gravel, sand, and mudstone beds and included picklike tools, basic hand axes, and broken pieces of stone left behind in the tool-making process..这些工具遗迹位于一系列的砾石、沙滩和泥岩床上，包括类似镐的工具、基本手持工具和在工具制造过程中残留的碎石片等。