STUDENT ASSIGNMENTS FOR WORKING WITH LAKE SEDIMENT CORES
At the undergraduate level a variety of assignments are tied to the coring. These include initial selection of sample sites in the context of the question being posed; this involves use of the Minnesota DNR ‘Lakefinder’ website (http://www.dnr.state.mn.us/lakefind/index.html), and review of latitude and Longitude (and conversion to/from decimal degrees) and topographic map reading. Preparatory work also includes evaluation of sediment data from nearby water wells, which requires use of the MN County Well Index (http://www.health.state.mn.us/divs/eh/cwi/index.html), construction of topographic profiles, and plotting and correlation of sedimentary units. Use of available surficial geology maps is also integrated into preparation for coring. The preparatory work, which also includes basic reading on limnology, allows students to make some reasoned predictions about the cores that will be extracted. Follow-up Lab work involves a trip to the Core Lab at the Limnological Research Center (http://lrc.geo.umn.edu/laccore/) to split and process the core, which is followed up by visual description and logging, grain-size analysis of selected intervals, and smear slide making and evaluation. Each student takes responsibility for one core or portion thereof, and each student has responsibility for producing a Lake Core report in which they integrate and interpret all the data, to tell the sedimentary history for the lake, and if possible, answer the research question posed.