Geology
The summit area composes the plagioclase-phyric andesite lavas of the Birker Fell Formation. A band of volcaniclastic sandstone passes near to the actual top. Further south are outcroppings of the Whorneyside Formation (bedded tuff and sandstone with some breccias, intersperced with andesite sills.) The lower slopes are covered by drift. Dubs Quarry at the foot of the northern slope is an extensive slate working, now abandoned.
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