Is it a Cauldron?

The big chunk of metal we found in the hole in the middle of the floor in the "first room" was all crusty and stones had welded themselves to it with rust, so, we took it home and cleaned it up and this is how it looks:

The next picture, though not very clear, shows the profile of the rim.

....and this picture shows what we think is where a leg joined the cauldron before it was broken off.

...and finally, this is what we think it would have looked similar to: