Murchison published his Silurian system in 1839, wherein he recognized the Cambrian to include the barren slates and grits of Harlech, Llanberis and the Long Mynd.
Among the Shropshire Hills may be mentioned the isolated Wrekin (1335 ft.), Long Mynd (1674 ft.) and the Clee Hills (Brown Clee, 1805 ft.).
Wenlock Edge, running from south-west to north-east, is an escarpment of Silurian limestone, while the broad upland of Long Mynd, nearly parallel to it on the north, is a mass of Archaean rock.
The slates of the Long Mynd, on the Shropshire border, belong to this system.
Mae'n hanfodol ein bod yn mynd ati mewn ffordd wahanol i ddatrys y broblem hon.
In summer, the rare ring ouzel can sometimes be seen flying above the high moors of The Long Mynd.
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