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。

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A nearby volcano erupted violently, sending out a hail of molten rock and boiling mud.

一座附近的火山猛烈爆发，喷出大量熔岩和沸腾的泥浆。

《柯林斯英汉双解大词典》

The sample consisted of pebbles of hardened sediment that had once been soft, deep-sea mud, as well as granules of gypsum and fragments of volcanic rock.

这一样本包括曾经柔软的的硬化沉积物的卵石、深海淤泥以及石膏颗粒和火山岩碎片。

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Between 1, 000 and 1, 500 tonnes of mud and rock is being removed from the site between Newton Abbot and Exeter.

BBC: Devon mud-hit railway line reopens

So extensive were the wet-season mudslides that in some years more mud and rock fell back into the canal than had been taken out in the first place.

ECONOMIST: The Panama Canal

The eruption also engulfed a small Maori village, Te Wairoa, in mud, ash and rock.

BBC: Lakeside treks in a geothermal land