Trulove, Susan2015-10-292015-10-292008-11-10http://hdl.handle.net/10919/61494From shells to bones, the skeletons of organisms contain small amounts of impurity elements such as magnesium. Because the levels of these elements provide important clues to past environments, a considerable effort has focused on understanding how to relate impurity contents to the ancient environments in which an organism lived.text/htmlIn CopyrightCollege of SciencePress releaseVirginia Tech. University Relations