Flaum, J.A. [0000-0003-1251-1142] Birdwell, J.E. [0000-0001-8263-1452] 20250710 tabular digital data https://doi.org/10.5066/P14MHAZT Flaum, J.A. Birdwell, J.E. 2025 publication Geological Society of London Special Volume: “Integrated Analyses of Carbon Burial in Marine Mudstones throughout the Phanerozoic” To Be Submitted Geochemical and mineralogical data were collected for samples of the Devonian Marcellus Shale, as well as overlying and underlying units in the Enerplus Snow Shoe 4-8HG core. The data was integrated with well logs in a manuscript that focuses on the estimation of original organic richness (total organic carbon content) in thermally mature petroleum source rocks. This data release contains data generated by USGS laboratories or contract laboratories using USGS methods and quality control processes. Core photos and other datasets collected on this core can be accessed at the USGS Core Research Center’s website under library number V065 (https://my.usgs.gov/crcwc/core/report/135378). Samples were collected for geochemical and mineralogical characterization to further the research efforts related to petroleum source rocks and more generally petroleum resource assessment goals of the USGS Energy Resources Program. These samples represent thermally mature (gas window) source rocks in a prominent natural gas producing region and the estimation of their original organic richness using geochemical and well log data can inform the potential resources that have been produced. The data also provide general information on the geochemical and mineralogical variability in this stratigraphic sequence which can be used with log data to evaluate log responses related to organic and mineral facies changes that can then be mapped regionally using logs from other wells. The data release includes one .csv file (MarcellusCore_data.csv) containing the datasets and one .csv file with the data dictionary (MC_Column_descriptions.csv). An additional zip file containing a collection of well logs (as .LAS files) is also included. Metadata and information regarding the content and origin of those .LAS files are provided in the well log headers. 2011 2021 2022 ground condition Complete None planned -77.5759 -77.5758 41.3341 41.3340 ISO 19115 Topic Category geoscientificInformation USGS Energy Program Marcellus Shale source rock geochemistry well logs Devonian delta log R USGS Thesaurus geochemistry borehole logging USGS Metadata Identifier USGS:686d8ea4d4be026f4a016455 None Appalachian Basin Marcellus Shale Common geographic areas Pennsylvania 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 accessed 4/7/2023 https://www.usgs.gov/media/files/60-elements-icp-oes-ms-na2o-fusion-method Poppe, L.J. Paskevich, V.F. Hathaway, J.C. 2001 publication Open File Report 01-041 https://www.usgs.gov U.S. Geological Survey https://doi.org/10.3133/ofr0141 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 includes 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 reports fell within expected ranges. Some Tmax values (from programmed temperature pyrolysis) were less than 300°C and are listed as “UD” (unreliable data). This was due to very low S2 peak intensities for these samples (Tmax is derived from the S2 peak). For some elements, concentrations were below the reporting limit (BRL) for the method used and are indicated in the data table as “BRL”. In the mineralogy data, not all mineral phases identified in the sample set were detected in all samples, and these instances are indicated as “ND” (not detected). Collection of samples from the core was done at the USGS Core Research Center in Denver, CO, in one visit in February 2021. Sample preparation involved powdering rock samples according to procedures established by the USGS Petroleum Geochemistry Research Laboratory (PGRL). All samples were analyzed for total carbon, total organic carbon, and programmed temperature pyrolysis by PGRL (Oliver and Warden, 2020; Dreier and Warden, 2021). PGRL also facilitated analyses by outside commercial laboratories, including AGAT Laboratories, who measured major and trace element concentrations on all samples using a USGS inductively coupled plasma optical emission spectroscopy and mass spectrometry (ICP-OES/MS) method (U.S. Mineral Resources Program, 2019), and Activation Laboratories, who performed mineralogical analysis by X-ray diffraction (Poppe and others, 2001). Data generated by Activation Laboratories (diffractograms) were reinterpreted by USGS personnel to confirm mineral identifications and to quantify their abundances. 2024 MarcellusCore_data contains the following: UD - Unreliable Data ND - Not Detected BRL - Below Reporting Limit See "Completeness Report" for definitions Please see MC_Column_descriptions for full data dictionary 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/P14MHAZT None 20250710 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