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Faughan and Dungiven Basins - CumberLondonderry
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Summary Full report
Site Type: Inland exposure
Site Status:
Grid Reference: X25574056
Rock Age: Quaternary
Rock Type: Gravel, Sand
Other interest: No data, Glacio-fluvial sediment, deltaic foresets

Summary of site:

In an area around Cumber, south south east of Claudy, there is a flat-topped feature of around 4kmē, consisting of sands and gravels, lying in a hollow in the local bedrock.

After a period of deposition following the initial ice retreat, ice dammed the Faughan valley creating a glacial lake with a surface 126m above modern sea level. Meltwater flowing into the lake (probably from the south) carried glacial debris, creating possibly two flat-topped deltas of cross-bedded and ripple-marked sands which were then violently scoured into channels by torrential flow and later filled with cobble and pebble gravels. This episode was followed, after the lake had drained, by a period of intense cold when the deposit froze to depth and ice wedges were able to form (six have been seen in the area).

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