Radioactive nodules

Radioactive rock!

One of the most unusual features of the coast are these radioactive nodules from Littleham Cove. The radioactive elements almost certainly came from the Dartmoor Granite as it was eroded early in the Triassic period or possibly even in the late Permian. The radiation levels are very low, about the same as an old-fashioned luminous watch. As it oxidised over millions of years, it has turned the surrounding clay from red to grey. 

Find out more on the rocks and pseudofossils pages.

Common name

Radioactive nodules


Rocks and Pseudofossils


Aylesbeare Mudstone

Time period



245 million years

Where found

Littleham Cove

Found by



Fairlynch Museum, Budleigh Salterton

Accession number

BULFM-nodules 02