 Adjacent to the hotel the granite is coarse-grained with large phenocrysts of orthoclase, sometimes more than in length.To the north, at the First and Last House, there is a finer-grained granite with fewer and smaller phenocrysts, and the different granites can be seen from a distance by the smoother weathering of the finer variety.The granite dates to 268–275 million years ago of the Permian period.