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From Wikipedia, the free encyclopedia
The Narrow Vein Mudstone Formation (commonly known as the Narrow Vein) is an Ordovician lithostratigraphic group (a sequence of rock strata) in Mid Wales. The rock of the formation is silty, homogeneous or finely-laminated mudstone. It generally a medium blue colour. This formation has been commercially quarried as slate in several locations along its length. The formation is between 400 metres (1,300 ft) and 560 metres (1,840 ft) thick and runs from Dinas Mawddwy south-west to Cardigan Bay at Tywyn.[1]
Narrow Vein Mudstone Formation | |
---|---|
Stratigraphic range: Hirnantian | |
Type | Group |
Unit of | Abercorris Group |
Underlies | Garnedd-Wen Formation |
Overlies | Broad Vein Mudstone Formation |
Thickness | 400 metres (1,300 ft) to 560 metres (1,840 ft) |
Lithology | |
Primary | Mudstone |
Other | Slate |
Location | |
Coordinates | 52°40′33″N 3°49′23″W |
Region | Mid Wales |
Country | Wales |
Extent | Dinas Mawddwy to Tywyn |
The formation is exposed in a number of locations in Mid Wales where glacial valleys cut across it. It is especially visible in the quarries along its length
The Narrow Vein is one of the two major slate veins in Mid Wales that were commercially quarried. Narrow Vein rock is generally more splittable than Broad Vein rock and was often used to make roofing slates.[2]
The Narrow Vein was quarried in the following locations:
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