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Berw Fault

The Berw Fault is a southwest–northeast trending Late Palaeozoic to Cenozoic brittle fault that reactivates an older zone of ductile shear, the Berw Shear Zone. It forms the northwesternmost part of the [[Menai Strait Fault Zone]], which also includes the Dinorwic and Aber Dinlle faults. On Anglesey and offshore to the northeast, it forms the southeastern boundary of the Berw Basin, in the southern part of the East Irish Sea Basin.

Extent
The Berw Fault was originally defined at the surface on Anglesey where it juxtaposes Carboniferous sedimentary rocks to the northwest with strongly sheared Penmynydd Zone metamorphic rocks and parts of the Monian Supergroup to the southeast. Seismic reflection data in the neighbouring offshore areas have extended it significantly further to the southwest and particularly to the northeast, where it controls the margin of the Berw Basin, cutting Permo-Triassic rocks. ==Development==
Development
The Berw Shear Zone forms the upper part of the Penmynydd Zone, also known as the Penmynydd Terrane, a highly deformed, schistose unit that contains blueschist assemblages. The Penmynydd Zone has been identified on seismic reflection data offshore, as a zone of strong northwest-dipping reflectivity. Later brittle faults, such as the Berw Fault, are interpreted to detach into the top of the zone. ==See also==
Source: Wikipedia ↗
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