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Panorama of part of the Snowdon Massif including Snowdon (centre right) taken from Mynydd Mawr.The Glyderau are visible in the distance.. The bedrock geology of Snowdonia is largely formed from a sequence of sedimentary and igneous rocks originating during the early Palaeozoic (the Cambrian, Ordovician and Silurian periods, lasting between 539 and 419 million years ago).
The Ingleton Group is a group of Ordovician turbiditic sandstones, siltstones, conglomerates found within inliers in the Craven district of North Yorkshire, England.The two inliers are exposed in the valley of the River Doe northeast of Ingleton and at Horton-in-Ribblesdale to the east.
BGS Groundhog Desktop is a software tool developed and made available by the British Geological Survey and used for geological data visualisation, interpretation and 3D geologic modelling. It is available in both free-to-use and commercial editions. Groundhog Desktop is a key part of the BGS's work to develop 3D models of the UK subsurface. [1]
Silurian rocks are found in the northwest of the park where a north-east to south-west aligned tract of country running (within the park) from Halfway southwest to Trap is known to geologists as the Myddfai Steep Belt and formed from a succession of sandstones and mudstones of Wenlockian, Ludlovian and Pridoli age.
The Clwyd Limestone Group is a stratigraphic unit (a defined sequence of rock layers) of Chadian to Brigantian age (Lower Carboniferous) found in north Wales.It forms part of the Carboniferous Limestone Supergroup. [1]
The geology of the Yorkshire Dales National Park in northern England largely consists of a sequence of sedimentary rocks of Ordovician to Permian age. The core area of the Yorkshire Dales is formed from a layer-cake of limestones, sandstones and mudstones laid down during the Carboniferous period.
The former derives from cumulative snowfall on the Welsh mountains whilst much of the latter had a more distant provenance and moved onshore from Cardigan Bay. The lower courses of the Ystwyth and Rheidol are seen to be glacial in origin (or at least glacially modified) together with sections of the Aeron and Teifi valleys amongst others.
The Afon Cilieni is a short river which rises on the southern slopes of Mynydd Epynt in Powys, Wales.The name may mean ' the river rising in a small nook'. [1]Its upper reaches are within the military training area of SENTA, the British Army's Sennybridge Training Area.