Each folder in the supplemental data has a readme or summary file explaining
 the content of the file. All of the information available in the Supplementary
 Data is also available at Ridge, J.C., 2012, ÒThe North American Glacial Varve ProjectÓ: (currently http://geology.tufts.edu/varves , as of August 31, 2012 http://eos.tufts.edu/varves), sponsored by The National Science Foundation and the Department of Earth and Ocean Sciences, Tufts University, Medford, Massachusetts. Accessed June, 2012.