Rocks / Sole marks, Oscillation ripples.

These structures are a sub-division of groove casts, oscillation ripples, formed in a shoreline or shallow marine environment. They are the result of two directional currents. The cross section is not immediately obvious, but my close inspection of the specimen as a whole is conclusive. The specimen was collected from Tan y Foel quarry, 5Km. S.W. of Llagllugan, near Newtown, and is from the Penstrowed grits formation, in the Silurian.

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