These ‘fossilised’ roots are from plants that lived on the banks of temporary rivers that flowed through the Triassic desert. When the water stopped flowing, the baking sun drew moisture out of the ground and in the process minerals such as calcium cemented the ground around the roots. This formed ‘rhizoconcretions’ – rhizome meaning root, and concretion meaning cemented or concreted.
The same process is still happening today, as shown on the photo from the Cape Verde Islands off Africa.
Find out more on the wood and plants pages.