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The formations below the Arenig or Stiper-stones group are treated of in the next chapter, when the "Primordial" or Cambrian group is described. LUDLOW FORMATION: a. Upper Ludlow beds: 780. b. Lower Ludlow beds: 1,050. WENLOCK FORMATION: a. Wenlock limestone and shale and b. Woolhope limestone and shale, and Denbighshire grits: above 4,000. Lower Llandovery: 600-1,000.
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