Description and origin of some talus‐foot debris accumulations, Aghla Mountains, Co. Donegal, Ireland
Abstract The morphology and site characteristics of talus‐foot debris accumulations in the Aghla Mountains, Ireland, suggest that these landforms are fossil protalus ramparts and talus‐derived rock glaciers. The ramparts are linear or arcuate ridges or benches located within 45 m of the talus foot....
| Published in: | Permafrost and Periglacial Processes |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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Wiley
1993
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| Online Access: | http://dx.doi.org/10.1002/ppp.3430040305 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.3430040305 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.3430040305 |
| Summary: | Abstract The morphology and site characteristics of talus‐foot debris accumulations in the Aghla Mountains, Ireland, suggest that these landforms are fossil protalus ramparts and talus‐derived rock glaciers. The ramparts are linear or arcuate ridges or benches located within 45 m of the talus foot. The rock glaciers comprise several transverse ridges and depressions, interpreted as flow structures, and extend further from the talus foot than the ramparts. At least one rock glacier developed from a rampart. The ramparts indicate the former existence of perennia snowbeds and the rock glaciers are considered to result from the deformation and creep of interstitial ice (permafrost). There is no clear evidence of large scale‐slope failures or glacier ice having influenced debris accumulation. The landforms are probably of Nahanagan Stadial age (c. 11‐10 ka BP) and testify to the susceptibility of well‐jointed quartzite cliffs and talus to significant modification under the severe climatic regime of the stadial. |
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