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 mudrock.
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。
2
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》
3
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.