Head Without A Face

This grave in Louisville's Cave Hill Cemetery features a striking female bust nestled inside a great scalloped shell... but there's no face.

I'm not sure if this is vandalism or natural erosion. The rest of the grave seems much better preserved than the face, so maybe the former. The effect is quite eerie to me, like some sort of Venusian shrine, utilizing one of those styrofoam wig-heads.