The Thüster Berg is an upfold of Thüster limestone. On its steeply sloping northern flanks there are several limestone crags, mostly hidden in forest, which have names such as Eckturm, Dreckturm, Falkenturm and Liebesnadel (literally: Corner Tower, Mud Tower, Falcon Tower and Needle of Love). The rock ledge of the Eckturm ( NN) juts out of the forest towards the northwest below the summit of the Kanstein and forms a natural observation platform. There are disused limestone quarries on the southwestern side of the ridge.