Section through stalagmite (IMAGE) University of Göttingen Caption Section through the MA-1 stalagmite from Arevalo Cave showing the fine layering of limestone. These deposits are a geochemical archive of the changing environmental conditions at the Earth's surface over more than 4,000 years. Credit Scan of the stalagmite sample: R Kilian/G Wörner Usage Restrictions None License Original 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.