A geomorphological map of Cadair Idris, Wales

Abstract

This paper presents a new 1:10 000 scale geomorphological map of Cadair Idris, Wales. The geomorphology was mapped by the interpretation of colour aerial photographs (scale 1:10 000) and eld investigations of landform/sediment associations. Digital Elevation Models (horizontal resolution 5 m, vertical resolution 1 m) sourced from NEXTMap Britain were used to supplement the geomorphological mapping, signi cantly enhancing the ability to observe and identify landforms, bedrock structure and landscape composition. The geomorphological map shows the spatial distribution of glacial, periglacial and postglacial landforms such as cirques, end moraines, glacial striations, block elds, tors, meltwater channels, scree slopes and alluvial fans. Some of these features have not previously been identi ed, such as recessional moraines. The mapped landforms are used to make inferences about the glacial history of the area and will thereby give insight into the palaeoglaciology of the central Welsh uplands. The geomorphological mapping will also be used as basis for geoconservation planning by the Countryside Council for Wales and the Welsh Regionally Important Geological / Geomorphological Sites groups.