During much of the most recent ice ages, from 1.8 million years ago, the sea level in the Severn Estuary was some below the current level and Flat Holm was joined to the Somerset coast as an extremity of the Mendip Hills.
The sea level in the Severn Estuary was some below the current level. This was during much of the most recent ice ages. This was from 1.8 million years ago. Flat Holm was joined to the Somerset coast as an extremity of the Mendip Hills. This was during much of the most recent ice ages.