The following analysis was performed using a Costech Elemental Combustion System 4010 connected to a Thermo Finnigan ConfloIII Interface and Deltaplus Continuous Flow-Stable Isotpe Ratio Mass Spectrometer. IAEA, USGS, and NIST certified isotopic standards are run at the beginning of each analysis. One certified standard is also run at the end of the analysis to check for stability of the calibration. These standards are recognized internationally, and are used to calibrate the CO2 and N2 reference gases which are analyzed in conjunction with every individual sample. Values are reported on the VPDB scale for d13C and the Atm. air scale for d15N. An internal standard is usually run every 10 samples. The precision of the certified isotopic standards are typically 0.2 to 0.5 per mil, so the best analytical precision we report is +/- 0.25 per mil for d13C and +/- 0.5 per mil for d15N. Therefore, representations of isotopic values in resulting graphs and text should be to one digit beyond the decimal point. Please contact Jennfer Eikenberry with any questions. Please also refer to the Run ID for questions about specific samples.