Roadside attractions in Westford

This is next to Graniteville Rd just north of the main hill in Westford.

As you drive along Rt 40 there are several places where rock piles are visible from the car. Today there has been enough snow melt that rock-on-rocks are easy to spot. This one is near the entrance to the MIT Lincoln LabA little east of there on Rt 40, I spotted a bit of a pile and got out to find five or six rock-on-rocks, pairs, and perhaps other things hidden under the snow.There was a hint that these piles might have had some alignments and had supported pointers (smaller rocks pointing up out of a pile).