Dear Isogeochemists, Several colleagues and I have been reconstructing fish life history in the Laurentian Great Lakes for a few years now. Although we have a few isotope values for the water d18O and d13C(DIC) during our recent study period, we do not have much prior to our work (one sample from 1998). Is there ANY data out there, published or otherwise on oxygen and/or carbon isotope values of Lake Michigan and the Lake Michigan watershed (Muskegon Lake in particular). There is a bit more data on Lake Erie and Lake Ontario, but we'd be interested in anything that we may have missed. Thanks, Bill -- Dr. William P. Patterson Associate Professor Department of Geological Sciences 114 Science Place University of Saskatchewan Saskatoon SK S7N 5E2 Canada Phone: 306-966-5691(office); 306-966-5712(lab) Email: [log in to unmask] Web: http://128.233.87.242/bill.html