Carningli by John Brett

This is the Carningli oil painting by John Brett, dated to 1882.  It's available from the Bridgeman web site for reproduction and commercial use -- hence the watermark on the image.  More info here:

http://www.bridgemanart.com/asset/241920/Brett-John-1831-1902/Carn-Englyn-1882-oil-on-canvas

Look at the dense gorse high on the mountain, and the swathe of heath on the mountainside.  My guess is that there was much less intensive agriculture at the time, and that there were far fewer sheep on the mountain.