Prepared following the 2007 GSA Annual Meeting in Denver, Colorado, these 15 guides illustrate the latest geological and archeological thinking on a variety of current research themes.

Following the success of the first edition, this pioneering study of pharmaceuticals in the environment has been updated and greatly extended. It includes the status of research on pharmaceuticals in soil, with attention to terrestrial and aquatic environments as well as new substance categories such as tetracylines and chinolones and the latest results concerning contamination of the environment and risk reduction.

Selected and reviewed papers from the Groundwater Quality 2007 conference held in Fremantle, Australia, 2-7 December 2007.