On a recent visit to York i found that the curb stones appear to be Whin stone, and ide bet they originate from one of the Cleveland Dyke quarries between Stainton and Cliff rigg. The image shows a rare earth magnet stuck to a curb stone not far from the Shambles,in York city centre.
The second image is the boothem area of york the curb stones tested here were also magnetic.
The second image is the boothem area of york the curb stones tested here were also magnetic.