Three-dimensional graph of organic matter sources and sites/time periods. Sources are marine production (red triangle), river-derived (green triangle), and petrocarbon (black triangle). Averages at different sites and time periods are shown for the DWH site in December 2010 (red square), DWH site after 2013 (purple star), Reference site (orange circle), Seep site non-trough (blue square), and Seep site trough (yellow square). DOI: https://doi.org/10.1525/elementa.298.f6