![One million year old groundwater in the Sahara revealed by krypton-81 and chlorine-36]()
One million year old groundwater in the Sahara revealed by krypton-81 and chlorine-36Sturchio, N. C.; Du, X.; Purtschert, R.; Lehmann, B. E.; Sultan, M.; Patterson, L. J.; Lu, Z.-T.; Müller, P.; Bigler, T.; Bailey, K.; O'Connor, T. P.; Young, L.; Lorenzo, R.; Becker, R.; El Alfy, Z.; El Kaliouby, B.; Dawood, Y.; Abdallah, A. M. A. · Geophysical Research Letters · 2004