句中的 lie buried 是系表结构。这样的用法很普遍，又如：

She lay sprawled across the bed. 她手脚摊开趴在床上。

More than 9,000 men lie buried here. 这里埋葬了9,000多人。

Broken glass lay scattered on the carpet. 碎玻璃散落在地毯上。

A huge rattlesnake lay coiled on the blanket. 一条巨大的响尾蛇盘绕在毯子上。

The picture lay hidden in the archives for over 40 years. 这张照片在档案室中藏了40多年。

The artist had depicted her lying naked on a bed.  画家画出了她裸体躺在床上的姿势。

The journal she had begun lay neglected on her bedside table. 她早就开始看的那本杂志搁在床头柜上，好久没翻了。

a two-page memo lying unread on his desk  一份两页的备忘录放在他桌子上，还没看过