Bruce took me to a site he found near Rt140 in Lakeville, MA. This is well south of the "snow line" where it has been raining in the last week and the walking was easy. On March 3 this was a first spring day [later March 4 in Berlin, I was back to winter, but anyway...].
Here is a first view of a major group of boulders, several of which are propped up.
Here is a detail.Then there was another big one, shown in this video: