This child page contains: (a) qualitative compositional data for 3 elements (chromium, manganese, and iron) as determined by X-ray fluorescence spectrometry using a portable instrument (“pXRF”) mounted in a test stand in the laboratory and (b) quantitative compositional data for up to 60 elements (some not reported quantitatively) determined by chemical digestion (sodium peroxide fusion) followed by inductively-coupled plasma-optical emission or inductively-coupled plasma-mass spectrometry, and (c) quantitative total organic carbon data. The pXRF data collected after July 22, 2019 presented here is subject to secondary data review as required by the Energy and Minerals Mission Area Quality Management System (EMMA QMS). Data collected by the contract lab AGAT is not subject to the EMMA QMS. As this process is not yet complete, data collected after July 22, 2019 must be considered preliminary or provisional (subject to revision). They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are provided on the condition that neither the USGS or the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the data. When secondary data review is completed, this provisional statement will be removed.