>My source for so naming the "moelfre" feature was The Portal, and AndyB says the original >source was the Burl books, 1976, 1993 (Rows), updated in 2000 and reproduced with >permission.
I've found the relevant entry in Burl's From Carnac to Callanish, 1993.
Here it is, in its entirety:
Moelfre. SH721746. 3St. Grinsell, 1976, 261