Square worked stone, from the same "monument" area.

This is not a very good picture...but notice how the rocks head protrudes out over the little stone bench right underneath the throat area ? ( looking to the right) 
Sitting on the bench, ones head is positioned to come right up into the "hollowed out" place built in there. There is also a long hollow tube sort of thing that goes right to the back end, inside there as well.

I am looking up at this one, it is the largest I have found so far.
It looks as though it is riding in some sort of a boat!

The one in the picture above, seems to be watching over the trail below and almost seems ready to climb down that earthen banking. There are two smaller rocks resting on this turtles neck, but I did not touch them or inspect them in anyway, so I don`t know what these might be.

This one above is very big!