Image of Carwynnen Quoit by Rhiannon

From Naenia Cornubiae (1879), by William Copeland Borlase.
archive.org/stream/naeniacornubiaed00borluoft#page/25/mode/1up
Maybe the style of this suggests the 18th century W. Borlase??

Image credit: W.C.B.
Rhiannon
Rhiannon Apr 2, 2015