Timing of last deglaciation in the Cantabrian Mountains (Iberian Peninsula; North Atlantic Region) based on in situ-produced 10 Be exposure dating Laura Rodríguez-Rodríguez a, * , Montserrat Jim  enez-S  anchez a , María Jos  e Domínguez-Cuesta a , Vincent Rinterknecht b , Raimon Pall  as c , ASTER Team d a Dpto. Geología, Universidad de Oviedo, Arias de Velasco s/n, 33005 Oviedo, Spain b Universit e Paris 1 Panth eon-Sorbonne, CNRS Laboratoire de G eographie Physique, F-92195 Meudon, France c Dept. Din amica de la Terra i de l’Oce a, Universitat de Barcelona, 08028 Barcelona, Spain d Aix Marseille Universit e, CNRS-IRD-Coll ege de France, UM34 CEREGE, 13545 Aix-en-Provence, France article info Article history: Received 16 January 2017 Received in revised form 13 July 2017 Accepted 17 July 2017 Keywords: 10 Be surface exposure dating Last deglaciation Heinrich Stadial 1 Younger Dryas Cantabrian Mountains Iberian Peninsula abstract The Last Glacial Termination led to major changes in ice sheet coverage that disrupted global patterns of atmosphere and ocean circulation. Paleoclimate records from Iberia suggest that westerly episodes played a key role in driving heterogeneous climate in the North Atlantic Region. We used 10 Be Cosmic Ray Exposure (CRE) dating to explore the glacier response of small mountain glaciers (ca. 5 km 2 ) that developed on the northern slope of the Cantabrian Mountains (Iberian Peninsula), an area directly under the influence of the Atlantic westerly winds. We analyzed twenty boulders from three moraines and one rock glacier arranged as a recessional sequence preserved between 1150 and 1540 m above sea level (a.s.l.) in the Monasterio valley (Redes Natural Park). Results complement previous chronologic data based on radiocarbon and optically stimulated luminescence from the Monasterio valley, which suggest a local Glacial Maximum (local GM) prior to 33 ka BP and a long-standing glacier advance at 24 ka coeval to the global Last Glacial Maximum (LGM). Resultant 10 Be CRE ages suggest a progressive retreat and thinning of the Monasterio glacier over the time interval 18.1e16.7 ka. This response is coeval with the Heinrich Stadial 1, an extremely cold and dry climate episode initiated by a weakening of the Atlantic Meridional Overturning Circulation (AMOC). Glacier recession continued through the Bølling/Allerød period as indicate the minimum exposure ages obtained from a cirque moraine and a rock glacier nested within this moraine, whichyielded ages of 14.0 and 13.0 ka, respectively. Together, they suggest that the Monasterio glacier experienced a gradual transition from glacier to rock glacier activity as the AMOC started to strengthen again. Glacial evidence ascribable to the Younger Dryas cooling was not dated in the Monasterio valley, but might have occurred at higher elevations than evidence dated in this work. The evolution of former glaciers documented in the Monasterio valley seems consistent with previous 10 Be chronologies reported in other mountain ranges of the Iberian Peninsula, which have been recalculated according to a common production rate and scaling scheme. However, the re-evaluation of published 10 Be chronologies has highlighted the fact that glacial evidence previously ascribed to the Younger Dryas might be more limited than previously thought and the need for additional studies to characterized the extent of glaciers during the Younger Dryas cooling. © 2017 Elsevier Ltd. All rights reserved. 1. Introduction The Last Glacial Termination led to major readjustments of the Earth's climate in response to the collapse and meltdown of Northern Hemisphere ice sheets, which disrupted ocean and at- mospheric circulation globally (Denton et al., 2010). Melt waters poured in the North Atlantic (NA) region triggered a strength * Corresponding author. E-mail addresses: laurarr@geol.uniovi.es, lauris_geo@hotmail.com (L. Rodríguez-Rodríguez). Contents lists available at ScienceDirect Quaternary Science Reviews journal homepage: www.elsevier.com/locate/quascirev http://dx.doi.org/10.1016/j.quascirev.2017.07.012 0277-3791/© 2017 Elsevier Ltd. All rights reserved. Quaternary Science Reviews 171 (2017) 166e181