Tarr Steps is an example of a 'clapper' bridge and is constructed entirely from large stone slabs and boulders. The reserve primarily consists of oak woodland but pockets of richer soil support ash, hazel and sycamore, while drier areas have been colonized by beech. The woodland is important for its moss, liverwort and lichen populations. In the spring visitors to the woods can see extensive carpets of bluebell.