I found the remains of the second menhir when visiting here 24th September 2005, and it seemed fairly clear that it was once a menhir. My description at the time reads as follows.
Nearby to the La Pierre Bamboche can be found the remains of another menhir, now fallen and broken. The remains can be found about 30 metres away, in the direction of Souilhac.
Something is not right. This message is just to keep things from messing up down the road