The biomarkers, mainly n-alkanes, preserved in the Roñanzas Peat Bog record allow to identify Sphagnum
vs. Ericacea-dominated episodes, which are related to five cyclic humid periods alternating with other five
dry phases, respectively, over the last 2500 years. Because of the excellent preservation of materials in
ombrotrophic bogs, with lacking of any anthropic influence, it is possible to extend these results to the
north of the Iberian Peninsula. Good correspondence is also observed with studies from the central part of
Spain and global palaeoclimatic events