Dating Weathering of Organic-rich Shales with U-Series Disequilibrium Peucker-Ehrenbrink, B. ; Sims, K. W. W. ; Jaffe, L. A. ; Petsch, S. ; Shimizu, N. Abstract Publication: Eleventh Annual V. M. Goldschmidt Conference Pub Date: May 2001 Bibcode: 2001eag..conf.3781P