The Pancas saltmarsh in the Tagus Estuary in Portugal. Metal rich concretions form on the roots of salt marsh plants. (Picture courtesy of Dr. Isabel Caçador, University of Lisbon)	Isabel, Miguel, and Carlos taking a core from the Rosario saltmarsh	The top of a core from Rosario saltmarsh. Note the root zone
A rhizoconcretion	Measuring porewater constituents with a voltammetric microelectrode	Voltammagram showing dissolved lead in the porewater of a saltmarsh core