page_title: Corn Du
section_title: Geology
hierarchical_section_title: Corn Du / Geology
caption_attribution_description: English: Tommy Jones Obelisk Erected in memorial to the five-year old boy who died here in 1900 when he lost his way. Pen y Fan can be seen to the left and Corn Du to the right.
context_page_description: Corn Du is a summit of the twin topped Pen y Fan and the second highest peak in South Wales at 873 m, situated in the Brecon Beacons National Park. The summit itself is marked by a well structured Bronze Age cairn with a central burial cist like that on nearby Pen y Fan. The two summits are visible from great distances owing to their height above the surrounding moorland, and are famous landmarks. The views from the peaks are also panoramic and very extensive, the Black Mountain and Fforest Fawr being especially obvious to the west. Mynydd Epynt is visible to the north behind the county town of Brecon, and other parts of the escarpment to the east.
context_section_description: The summit is very similar to that of Pen y Fan: flat and anvil-shaped. It is similarly formed from the relatively erosion-resistant Devonian age sandstones from the Upper Old Red Sandstone known as the Plateau Beds. The rock strata are clearly visible at the edge of the escarpment, where they form a resistant edge to the cliff. The same strata are visible all along the escarpment facing north, as well as the rearward edge facing south-east and lying behind the main peaks. The same Plateau Beds recur in the Black Mountain (range) to the west, and cap the summits of Picws Du and Fan Foel, as well as forming steep cliffs below the peaks.
caption: The Tommy Jones obelisk with Pen y Fan (left) and Corn Du (right)
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