Roadside Attraction: Westford Rd Carlisle

Just across from the little red house there is a boulder in the wall with what looks like rock piles next to it - which could simply be broken stone wall. But looking carefully in the background there appears to be a pile there:
Here is a view back towards the road. I got out to take a look and it is a pretty little isolated pile - one huge chunk of light colored feldspar and another rock that looks red from being burnt. Unfortunately, isolated piles are not very informative. If you travel that road, check it out.