[Anti-Ratfish]

Making stuff and burying it is very common in archeology according to my (limited) knowledge. Chucking stuff as offerings into springs, holes etc as offerings. Burin it with dead people (anyone under that stone is now 2 dimensional). But I do agree that this seems odd - half burying...

[gedejong]

Guess it could be a case of bad foundation, causing it to slowly sink into the ground over many years. Judging the type of ground of the excavation site at the photo, it seems to contain a rather high amount of clay, which is a terrible foundation.

[redwood]

Allows you to prop it up

[Daniel_Newby]

> Making stuff and burying it is very common in archeology ...

Göbekli Tepe in Turkey is an interesting example: http://en.wikipedia.org/wiki/G%C3%B6bekli_Tepe