Dataset: Keratoisis Radiocarbon Dates
Deployment: BambooCoral_Hoenisch

Sampling and Analytical Methodology:
All radiocarbon dates were obtained at the National Ocean Sciences Accelerator Mass Spectrometry facility (NOSAMS). Prior to sample submission, 3 to 5 mg of powdered calcite was cleaned of organic material following the oxidative procedure given in Farmer et al. (2015). Clean calcite powders were submitted to NOSAMS and leached with 200 µL of 0.1N HCl under sonication immediately prior to hydrolysis to remove any adsorbed modern CO₂. Approximately 10-20% of the sample mass was removed by the HCl leach. Gorgonin samples were prepared following Sherwood et al. (2008): decalcified nodes were separated with tweezers and a scalpel into individual gorgonin units, comprising 3 to >10 gorgonin layers where distinguishable. Approximately 2 to 3 mg of gorgonin was subsampled from larger units, soaked in 5% HCl for 48 hours to remove any residual carbonate, rinsed in deionized water and dried prior to submission to NOSAMS.

Full methodology, equations, and discussion of instrumental precision are available from the NOSAMS website: http://www.whoi.edu/nosams/