On my annual survey of National Park Service Appalachian Trail boundary bushwhacking, I get to check out many stone walls and this old foundation.
From old maps, I believe this is the farm of W. Morrison.
Source: Atlas of Berkshire County, Massachusetts, 1904.
I need to research that a bit more, but given the relative location of the foundation, the NPS property lines and topography, it seems logical.
Here is a short video of the details.