Differential weathering incised the northern side of the mountain, producing cavities underneath the granite dome.
2.
Differential weathering on one side of the rock has created what is described as a stylized human face.
3.
It is semi-circular in horizontal section, some 40 m across, and formed in Jurassic lavas as a result of differential weathering.
4.
Differential weathering of a series of igneous intrusions has yielded a number of prominent hills in the landscape, most notably the Craigie and Broughty Ferry, the bedrock geology is of extrusive rocks, including mafic lava and tuff.
5.
In the book " Geomorphological Landscapes of the World ", it is suggested that the " face " of the structure is the result of differential weathering at the point where the granite cap of the mountain meets the gneiss layer.
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