求翻译：It had been opened in the Old Red Sandstone 老红砂岩of the district, and was overtopped by a huge bank of diluvial clay, which rose over it in some places to the height of nearly thirty feet, and which at this time was rent and shivered, wherever it presented an open front to the weather, by a recent frost. A heap of loose fragments, which had fallen from above, blocked up the face of the quarry and my first employment was to clear them away.是什么意思？

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