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Garnedd-Wen Formation facts for kids

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Garnedd-Wen Formation
Stratigraphic range: Hirnantian Age
Tarren y Gesail - - 736726.jpg
The upper slopes of Tarren y Gesail are primarily in the Garnedd-Wen Formation
Type Group
Unit of Abercorris Group
Overlies Narrow Vein Mudstone Formation
Thickness 1,000 metres (3,300 ft) to 3,000 metres (9,800 ft)
Primary Mudstone
Other Sandstone
Coordinates 52°38′07″N 3°54′26″W / 52.6354°N 3.9071°W / 52.6354; -3.9071
Region Mid Wales
Country Wales
Extent Tywyn to Dinas Mawddwy
Type section
Named for Garneddwen

The Garnedd-Wen Formation (also known as the Garnedd-Wen Beds) is an Ordovician lithostratigraphic group (a sequence of rock strata) in Mid Wales. The rock of the formation is a mixture of mudstones, siltstones, fine- to coarse-grained sandstones, greywackes and conglomerates. The formation extends from Dinas Mawddwy in the north-east to Tywyn in the south-west.


The Garnedd-Wen Formation is the upper strata of rock across a wide part of western Mid Wales. In particular, it forms the upper rock beds of the Tarren Hills on the south side of the Bala Fault, west of Talyllyn Lake.

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Garnedd-Wen Formation Facts for Kids. Kiddle Encyclopedia.