The Meaden Cobble Source Identified

The Meaden Cobble -- a clast of dark-coloured Carboniferous Limestone, probably from one of the Black Rock Limestone outcrops in Somerset - Brian John

Dr John is very excited by a cobble discovered on the track from Gunsite Lane (or Road) to West Kennet Long Barrow. He is concocting possible sources and glacial modes of transport for it.

https://brian-mountainman.blogspot.com/2026/01/a-black-limestone-cobble-from-west.html

https://brian-mountainman.blogspot.com/2026/02/the-meaden-cobble-probably-from-somerset.html

https://brian-mountainman.blogspot.com/2026/03/avon-gorge-another-possible-source-for.html

As I pointed out it is just ubiquitous Mendip Limestone hardcore used on the farms of Wiltshire to make up tracks, gateways and yards since Victorian times 

I checked the eastern end of the lane and it has been made up with such cobbles:

Looking west on the cobble track, note Silbury Hill top right. 

To help in the search for the source of the cobble I have annotated his aerial photo with where to look, and I think we can be sure it was transported by agricultural machinery rather than a glacier.