http://www.themodernantiquarian.com/site/8966/cefn_gwenffrwd.html
It is right on a boundary between parishes I seem to remember
Here is another whopper standing quietly in the trees by the possible stone row:
http://www.themodernantiquarian.com/site/8964/ty_newydd.html
Felt like they were all on a route from the tomb at Gelli:
http://www.themodernantiquarian.com/site/8320/gelli.html
to the complex at Cefn Gwernffrwd
http://www.themodernantiquarian.com/site/8971/cefn_gwernffrwd.html
It is truly is a wonderful locale - very much looking forward to trekking up to see Bryn y Gorlan.
http://www.coflein.gov.uk/en/site/521360/details/PEN+Y+RHIW+IAR%2C+MONOLITH/
Obviously I'll need to try and drop by at some point. It'll be interesting to see what you make of Bryn Y Gorlan. Cerrig's been there, too. I have to say I couldn't make a lot out of what Coflein mention....