the Airy's Bridge Formation. This consists mainly of welded rhyolitic lapilli-tuff and tuff, with some breccia. There are also minor intrusions of andesite above Styhead Gill. The summit dome is overlain by till. Summit Although surrounded by crags, the summit itself is of grass with a few boulders. A cairn marks the highest point. The view is restricted by higher neighbours, but the view north east down Borrowdale takes in Skiddaw and the Helvellyn range. The northern face of the Scafells is also seen in close up in the opposite direction. Water in view from the summit is restricted to Derwentwater and part of Styhead Tarn. Ascents Base Brown is often passed on the way to Sty Head and Esk Hause, along the popular paths which start at Seathwaite. Base Brown is itself almost exclusively climbed from this hamlet, via the cascades of Sour Milk Gill. Once the foot of Gillercomb is reached a choice presents itself. Either the walker can continue up the gill to reach Blackmoor Pols and then make an easy traverse back to the summit, or a direct line can be taken up the north ridge. Base Brown can be used as the first step to climbing Green and Great Gable. References Fells of the Lake District Nuttalls Allerdale