La Laguna de Rio Seco (IMAGE) University of Granada Caption La Laguna de Rio Seco lagoon, in Sierra Nevada (Granada), is where the researchers carried out the sounding and recovered the samples, using boats to do so. The lagoon is at an altitude of 3,020 m and has recently registered the evolution of atmospheric pollution from Neolithic times up to the present day and which, therefore, offer trails of the activities carried out by each of the peoples that have inhabited southern Spain: Phoenicians, Romans, Visigoths, Moslems, etc. Credit University of Granada Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.