Rock Identification Help

Hi there,
I’m needing some local help to help resolve a dispute between 2 of my colleagues.

On the M6 South bound services at Tebay is a small stone circle. The debate is whether these 3 x 2 metre high stones are Limestone or Mudstone. Is there any chance that one of your members could visit this site when passing to clarify and resolve this issue.
Darren (Budding amateur Geologist)

Stone circle

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