Instalación de los bosques deducida a partir del análisis polínico de un sondeo marino del Delta del Ebro (Tarragona, España)

PoIlen analysis from one marine core at the site of Tarragona coast (Spain) was studied. The colonisation of Quercus forest took place before 11000 years B.P. A comparative study of another records from the Iberian Peninsula confirms that the Postglacial colonisation was a temporal transgressive phenomenon along a latitudinal gradient. The lower part of the diagram, very probably corresponding to the Last Pleniglacial period, show some fluctuations in the percentages of Quercus, attributable to a slight climatic improvement.