Baradal is located within the Tobago Cays. On Baradal there are pillow lavas and submarine volcaniclastics which are overlain by Middle Eocene limestones. At the beach/water interface beachrock can be found.

Beachrock forms under conditions of rapid cementation in an intertidal zone, and the cementation is associated with the evaporation of seawater at low tide, when there is a concentration of dissolved minerals. Beachrock can develop very rapidly, from 1 to 10 years, and can be destroyed rapidly as well due to storms or biota. It can cause a change in the substrate, but it is the same composition as the sand. Beachrock provides a very diverse ecosystem for many types of flaura and fauna. It provides a habitat for borers to encrusters, photo-dependant and non-dependant animals, and it traps sediment at a rapid rate. Fauna includes worms, bryozoans, bivalves, algae, foraminifera, barnacles, limpids and many more.