Wudaoliang group is grayish - white, yellow - grey, dark - grey ash rock, which interbeded with the conglomerate, sandstone, a little amount mudstone, oil shale with unconsolidated sand mud rock.

五道梁群以灰白色、灰黄色灰岩为主，含有砾岩、砂岩，夹有少量泥岩、油页岩和未固结砂泥沉积。

youdao

The bar was formed by the mud and sand deposited here over a long period of time.

河里的泥沙淤积在这里，年深日久便成了沙洲。

《新英汉大辞典》

The camel's feet, well adapted for dry sand, are useless on mud.

骆驼的脚十分适合干旱沙地，但在泥地上毫无用处。

《柯林斯英汉双解大词典》

Steamers are usually harvested from sand or mud tidal flats.

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The event is held every Memorial Day weekend in Ferndale, California, as artists race their bizarre wares across a 42-mile course over three days, including sections on land, sand, mud and water.

BBC: Kinetic sculptures race land and sea

And while these works may seem ephemeral - often made from sand and mud rather than canvas and paint, their creators clearly expect them to survive beyond the next exhibition, leaving detailed instructions of how to recreate the work, and often rebuilding it themselves (as Turner nominee Karla Black did last week with her powder and make-up creation on the floor of Tramway).

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