The eruption seems to have started with the volcano spitting out lumps of rock up to 2 metres across, before releasing an enormous pyroclastic flow - a fast-moving gush of hot gas and rock.

火山似乎在释放出巨大的火山碎屑流(一种热的气体和岩石快速移动的喷流)之前，从开始吐出2米宽度的岩石块而开始爆发。

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The lithology is mainly composed of lava basalt, pyroclastic rock and volcanic sedimentary rock.

其岩性主要为熔岩类玄武岩，火山碎屑岩和火山沉积岩；

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The volcanic rock series in the Rucheng basin in southeastern Hunan is composed of the basalt, diabase and basaltic pyroclastic rock.

湘东南汝城盆地火山岩系由辉绿岩、玄武岩和玄武质火山碎屑岩组成，属于低钾拉斑玄武岩系。

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At first glance, it might seem obvious that it was through the action of flowing water (fluvial), but the Curiosity team needs to rule out the possibility that these rocks were deposited by the wind (aeolian) or by some kind of surge, such as the fast-moving clouds of gas and rock that will often plummet down the sides of particular types of volcano (a pyroclastic surge).

BBC: Curiosity Mars rover to investigate classic rock type