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Garnedd-Wen Formation facts for kids

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Garnedd-Wen Formation
Stratigraphic range: Hirnantian Age
Tarren y Gesail - geograph.org.uk - 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)
Lithology
Primary Mudstone
Other Sandstone
Location
Coordinates 52°38′07″N 3°54′26″W / 52.6354°N 3.9071°W / 52.6354; -3.9071Coordinates: 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.

Geography

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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