COMPARATIVE PALYNOLOGICAL ANALYSIS BETWEEN THE SAN ISIDRO AND LEITARIEGOS HOLOCENE SEQUENCES, NW SPAIN
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Abstract:
Palynological analysis of two drilling cores in San Isidro and Leitariegos Passes, NW of Spain, has been carried out. The comparative analysis of both sequences shows differences regarding the pollen types. Two pollen zones were defined in the San Isidro peat bog on the basis of percentage changes of tree and shrubs taxa. The pollen flora shows a Pinus dominated forest, and Betula, Quercus and Corylus succession probably related to an increase of temperature and precipitation. Three pollen assemblage zones have been defined in Leitariegos on the basis of variations of relative frequencies of tree taxa, and an increase in values of Betula pollen type suggest a birch forest, less important taxa are Quercus, Corylus and Pinus. Some aspects of mutual relationships between human activities, vegetation development and landscape building are outlined in San Isidro and Leitariegos sequences. Radiocarbon dates of both sequences record a diachronism between both deposits.
