I presume these magnetic Andesite boulders were originally part of the dyke in the Stainton area and were broken away by the last ice advance.
This stretch of Marton west beck has by far the largest deposits of Andesite dyke stone i have found anywhere in the south Cleveland area, the gravel layers in the beck banks are full of it, and all tested were magnetic.
These images show what i believe is the same red clay ive found underlying everything in the south west Middlesbrough area, with the gravel layer above.
The image below hopefully shows the amount of material above these layers, i would say at least a 35 metres
These images show the blue clay seem that ive also found in the red clay layer at Stainton, Maltby, and, Ormesby becks.
Red clay layer with gravel layer above, again the same as seen at Stainton, Maltby, and ormesby becks.