Garnedd-Wen Formation facts for kids
Quick facts for kidsGarnedd-Wen Formation
Stratigraphic range: Hirnantian Age
The upper slopes of Tarren y Gesail are primarily in the Garnedd-Wen Formation
|Unit of||Abercorris Group|
|Overlies||Narrow Vein Mudstone Formation|
|Thickness||1,000 metres (3,300 ft) to 3,000 metres (9,800 ft)|
|Extent||Tywyn to Dinas Mawddwy|
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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