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Trace elements incorporated into coralline aragonite can be used to provide a high resolution (weekly to fortnightly), long term (> 100 years) record of the seawater environment and changes to seawater trace element compositions. While there have been significant efforts to use the temporal trace element and isotope records to investigate climatic changes such as sea surface temperature and salinity at offshore sites, there has been less attention paid to the use of coral recorders of the land-sea interface. Here we report the trace element and δ 18 O record for a long lived Porites species coral from Havannah Reef on the inner Great Barrier Reef (GBR). This site is strongly influenced by runoff from the Burdekin River, the largest single source of terrestrial input to the GBR. Using high resolution laser ablation ICP-MS, continuous scans of the trace element composition for a Porites coral core, corresponding to 250 …