Geology
Successive rock strata are displayed along the descending ridge of Tewit How to the north west, displaying the architecture of the fell. At the top is the plagioclase-phyric andesite lava of the Birker Fell Formation, followed by the siltstone, sandstone, conglomerate, tuff and lapilli-tuff of the Eagle Crag Member. Further outcrops of the Birker Fell Formation are followed by a band of dacite before the igneous rocks of the Ennerdale Intrusion complete the picture.
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