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This file contains information on the supplemental data files associated with this manuscript. 
1. sample_descriptin.txt: lithologic descriptions with references for samples of continental crust analyzed

2.samples.csv: additional information on samples analyzed, including geographic location, rock name, sample name, and source of each sample. 
 
3. all_fluor_runs_raw.xls: Raw fluorometry data used in method development and continental crust budget. Standards and sample data are shown. Standard curves were constructed by averaging three fluorescence readings (R-1, R-2, R-3), subtracting initial fluorescence (Initial), and subtracting blank values. Shown are volume of standard/sample initially digested (Sample VP or mass rock), total volume of HF and KOH used for digestion and neutralization, amount of neutralized sample drawn from neutralized solution (Sample V, mL), and amount of H2O added to sample aliquot for fluorometry. Corrected fluorometry (Corrfluor) is net fluorescence corrected for dilutions either in fluorescence reaction bottle or digestion vial. A slope is calculated, forcing this slope through zero, along with an r2 value. This slope is used to calculate sample concentration, which is then corrected for dilutions. 

4. colourimetry_raw.csv: Raw colourimetry data. Shown are standard solutions and rock standards. Average absorbance is average of readings 1-3, with corrected absorbance accounting for extra dilutions made during absorbance reading. Resulting N concentrations are given in ppm. To account for dilutions made during sample preparation (first run only), concentrations for LKSD shown below were multiplied by 166.7 and Till samples multiplied by 50 to calculate actual concentrations.
The first set of analysis (D) were run on November 16, 2015 and the second set on January 29, 2016.

5. Fluorcolor_redux.csv: Summary of N concentration measurements for rock standards analyzed for fluorometry, colourimetry, and mass spectrometry. 

6. N_cc.xls: Summary of N concentration measurements made for continental crust N budget calculations.  