Birdwell, J.E. 2025 tabular digital data https://doi.org/10.5066/P1WCA9UF Bulk organic geochemical, major and trace element, and mineralogical data have been collected for core and cuttings samples of the Eocene Green River Formation from thirty-four wells in the Uinta Basin of Utah. The samples were collected from the U.S. Geological Survey Core Research Center in Denver, CO and the Utah Core Research Center in Salt Lake City, UT and represent multiple distinct stratigraphic intervals, including several that are being targeted for tight oil production in the northwestern part of the basin. These data have been collected since the previous assessment of the informal Uteland Butte member of the Green River Formation in 2015 and will inform future research and assessments of this unique lacustrine petroleum system. Much of this data is also relevant to various other petroleum-related resources (oil shale, gilsonite, tar sands) in eastern and southern parts of the basin. This dataset was acquired to support research into and assessments of the petroleum resources associated with the Eocene Green River Formation in Uinta Basin, UT, particularly the continuous oil and gas resources in units within the lower part of the Green River Formation like the informal Uteland Butte member and the underlying Wasatch Formation. The data release includes one .csv file (GRF_Data_All_Wells.csv) containing the datasets and one .csv file with the data dictionary (GRF_Column_description.csv). 2015 2025 ground condition Complete None planned -114.1260 -108.9404 40.9467 36.9148 ISO 19115 Topic Category geoscientificInformation Energy Resources Program Green River Formation source rock geochemistry mineralogy lacustrine shale Eocene USGS Thesaurus mineralogy Eocene USGS Metadata Identifier USGS:6841b179d4be024662c8e3f6 Energy Program Uinta Basin Common geographic areas Utah Uintah Duchesne No access constraints. Please see 'Distribution Information' for details. These data are marked with a Creative Common CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Justin E Birdwell USGS - ROCKY MOUNTAIN REGION Research Engineer mailing and physical

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Lakewood CO 80225 303-236-1534 jbirdwell@usgs.gov Mark F Dreier Augusta Warden 2021 document https://www.usgs.gov U.S. Geological Survey https://doi.org/10.5066/p9hqsbgh Thomas A Oliver Augusta Warden 2020 document https://www.usgs.gov U.S. Geological Survey https://doi.org/10.5066/p9x85huf USGS Mineral Resources Program 2019 document https://www.usgs.gov U.S. Geological Survey accessed March 7, 2025 https://www.usgs.gov/media/files/60-elements-icp-oes-ms-na2o-fusion-method USGS Mineral Resources Program 2019 publication https://www.usgs.gov U.S. Geological Survey https://www.usgs.gov/media/files/major-elements-wdxrf-method USGS Mineral Resources Program 2019 publication https://www.usgs.gov/ U.S. Geological Survey https://www.usgs.gov/media/files/total-sulfur-and-total-carbon-methods Quality control information on USGS methods is available from USGS Petroleum Geochemistry Research Laboratory (PGRL). Quality control procedures for analyses performed by PGRL and outside laboratories included the use of geochemical reference materials with established acceptance criteria for measured values of concentrations and other parameters. Replicate analyses were also performed to ensure reproducibility. All depths were estimated based on core markings and represent depth from ground surface and all latitude and longitude coordinates are reported using the NAD83 datum. All values fell withing normal and expected ranges. Not all measurements were made on all samples. Blank entries in the data table indicate that no measurement was made. Other qualifiers are used in the data table, including "ARL" and "BRL" to denote elemental concentrations that were above or below the reporting limit for the method used. Sample preparation involved powdering core or cuttings material according to procedures established by the USGS Petroleum Geochemistry Research Laboratory (PGRL). Most samples were analyzed for total carbon, total organic carbon (TOC), and programmed temperature pyrolysis by PGRL (Oliver and Warden, 2020; Dreier and Warden, 2021). Samples with TOC values below 0.5 weight percent were not analyzed by programmed temperature pyrolysis. PGRL also facilitated analyses by outside commercial laboratories, including AGAT Laboratories and SGS Mineral Services, who measured major and trace element concentrations on selected samples using a USGS method (U.S. Geological Survey Mineral Resources Program, 2019a). For some analyses conducted by these contract laboratories, some major (Ca, Si) and minor elements (Ba) exceeding the reporting limit for the inductively coupled plasma (ICP) optical emission spectroscopy and mass spectrometry method were analyzed by wavelength dispersive X-ray fluorescence spectroscopy (U.S. Geological Survey Mineral Resources Program, 2019b). Similarly, for samples with sulfur (S) content exceeding the ICP method reporting limit, a combustion-based method was used instead (U.S. Geological Survey Mineral Resources Program, 2019c). A smaller subset of samples was also analyzed for X-ray diffraction mineralogy by USGS staff using in-house methods. Some mineral phases have been grouped (e.g., potassium feldspars, illite/muscovite, high and low iron ankerite). 2025 “BRL” - indicates elemental concentrations that were below the reporting limit for the method used “ARL” - indicates elemental concentrations that were above the reporting limit for the method used See “GRF_Column_description.csv” file. U.S. Geological Survey - ScienceBase mailing address

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Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata, and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P1WCA9UF None 20250627 Christa D Chavez USGS - ROCKY MOUNTAIN REGION Information Technology Specialist mailing and physical

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Lakewood CO 80225 303-236-1644 cchavez@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998