Ballybricken East

In the field beside the standing stone there is another circle on the ordnance survey map, im not sure what it was pointing to. There is a stone under a tree in the area but surely they would have put it down as a standing stone. There is also the unusual piece of slope at the rear of the site which to me just looked odd in the surroundings. Im sure if they bring out an archeaological record of Limerick this can be resolved.