Evidence of glacial activity during the younger Dryas (12,9-11,7 ka BP) in the Iberian Peninsula
DOI:
https://doi.org/10.17735/cyg.v30i1-2.39250Keywords:
Younger Dryas, deglaciation, moraines, polished rocky thresholds, rock glaciers, Iberian PeninsulaAbstract
The Younger Dryas (GS-1, entre 12,9 y 11,7 ka BP) was characterized by a remarkable declining in temperature at a global scale. The consequence was a moderate re-advance of glaciers that also affected the main ranges of the Iberian Peninsula. This paper reviews the available information on the location, evolution and extent of such glaciers. The geomorphological activity during the Younger Dryas in the Iberian Peninsula has been identified throughout the presence of morainic deposits (dated in most cases with cosmogenic exposure ages), rocky thresholds polished by the ice, and rock glaciers. The best examples of Younger Dryas moraines were found in the Central Pyrenees, with short ice tongues of up to 4 km in length in the highest massifs and a number of glacial cirques. There is also evidence of small cirque glaciers in the Cantabrian Range and the Central System Range (Gredos and Guadarrama sierras), as deduced by rocky thresholds and morainic deposits close to cirque headwalls. Conversely, in Sierra Nevada (southernmost sector of the Iberian Peninsula) the only evidence of the Younger Dryas is the presence of rock glaciers that were developed during the Oldest Dryas and survived during the Younger Dryas.
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