This method identifies biomarkers in sedimentary organic matter, including rock extracts and petroleum, to provide insight into thermal maturity, depositional environment, reservoir characterization, oil-to-oil and oil-to-rock correlation, and source rock characterization.
Katherine French
Katherine (Kate) French is a research geochemist in the Central Energy Resources Science Center (CERSC) at the USGS in Denver, Colorado. She specializes in organic and petroleum geochemistry with a focus on hydrocarbon biomarkers in rocks, sediments, and oils.
Kate received a B.S. in chemistry from Yale University (2009), completed a Ph.D. in geochemistry from the MIT/WHOI joint program in oceanography (2014), and was an Agouron postdoctoral fellow at WHOI (2016). She started with the USGS in 2017 where she focuses on molecular characterization of sedimentary organic matter, developing improved analytical methods, and enhancing understanding of biomarkers in the sedimentary record. She has applied her research to geobiology of early Earth and Phanerozoic anoxia, organic matter transport from land to sea, and petroleum systems. She is a member of the Mars Sample Return Campaign Science Group (MCSG), which is a team that provides technical expertise to maximize the scientific potential of the Mars samples that would be returned to Earth as part of Mars Sample Return (MSR).
Professional Experience
Research Geochemist at the Central Energy Resources Science Center (CERSC) at the USGS in Denver (2017-present)
Agouron Geobiology Postdoctoral Fellow at Woods Hole Oceanographic Institution (WHOI; 2015-2016)
Education and Certifications
Massachusetts Institute of Technology – Woods Hole Oceanographic Institution Joint Program in Oceanography (MIT/WHOI); Ph.D. in Geochemistry (2010-2014)
Fulbright Scholar in Germany at the Alfred Wegner Institute for Polar and Marine Research (AWI; 2009-2010)
Yale University; B.S. in Chemistry (2005-2009)
Science and Products
Geochemical data for the relationship between whole rock S/Fe and degree of organic sulfurization in the Eagle Ford Group
Geochemical data were generated from multiple thermally immature drill cores of the Eagle Ford Group across Texas. This data set accompanies a journal article that shows the relationship between whole rock S/Fe and degree of organic sulfurization across the thermally immature Eagle Ford in Texas. The data include LECO total carbon and total organic carbon, programmed pyrolysis, whole...
Geochemical data for the Cenomanian-Turonian Eagle Ford Group recorded in the USGS Gulf Coast 3 (GC-3) drill core of southwest Texas (ver. 1.1, April 2025)
The Upper Cretaceous Eagle Ford Group in southwest Texas represents a geologic record of the Cenomanian-Turonian period in the southern Western Interior Seaway (WIS) of North America prior to and during the Oceanic Anoxic Event 2 (OAE-2). Geochemical data generated and compiled here were collected on core samples taken from a wellbore near Del Rio, TX for the purpose of better...
Daily operating standard data used for verification of the Petroleum Geochemistry Research Laboratory Method for Qualitative Biomarker Analysis of Crude Oil and Rock Extracts by Gas Chromatography-Single Quadrupole Mass Spectrometry
The data release contains biomarker data generated by Gas Chromatography-Single Quadrupole Mass Spectrometry in the Petroleum Geochemistry Research Laboratory. The data was used to determine the precision and accuracy of one daily operating standard for the method entitled, "Petroleum Geochemistry Research Laboratory Method for Qualitative Biomarker Analysis of Crude Oil and Rock...
Data release for Geochemistry of the Cretaceous Mowry Shale in the Wind River Basin, Wyoming
This Data Release contains data associated with the journal article "Geochemistry of the Cretaceous Mowry Shale in the Wind River Basin, Wyoming";. Data include bulk organic geochemistry, major and trace element geochemistry, mineralogy, extractable organic matter composition, extractable biomarkers, and organic stable carbon isotope analyses.
Data Release for "Comparability and reproducibility of biomarker ratio values measured by GC-QQQ-MS"
This data release includes biomarker ratio values calculated from measurements made at the USGS for the reference oil NSO-1 that were reported in a journal article entitled Comparability and reproducibility of biomarker ratio values measured by GC-QQQ-MS (French et al., 2020). French, K.L., Leider, A., and Hallmann, C., 2020, Comparability and reproducibility of biomarker ratio values...
Geochemistry data for the USGS Gulf Coast #1 West Woodway core - A thermally immature core of the Eagle Ford Group in central Texas (ver. 1.1, April 2025)
Petroleum source rocks deposited during Cenomanian – Turonian time (late Cretaceous) are major generators of continuous and conventional oil and gas resources in the Gulf of Mexico Basin. The Eagle Ford Shale is a particularly important petroleum system and represents a substantial fraction of total oil and gas production in the United States. Significant lateral and vertical geochemical...
PGRL Method for Qualitative Biomarker Analysis by GC-MSD
This method identifies biomarkers in sedimentary organic matter, including rock extracts and petroleum, to provide insight into thermal maturity, depositional environment, reservoir characterization, oil-to-oil and oil-to-rock correlation, and source rock characterization.
Filter Total Items: 20
Assessment of undiscovered conventional and continuous oil and gas resources in the Escondido, Olmos, and San Miguel Formations of the Western Gulf Basin Province, U.S. Gulf Coast region, 2023
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 5 million barrels of oil and 25 billion cubic feet of gas in conventional reservoirs and 361 million barrels of oil and 10,978 billion cubic feet of gas in continuous reservoirs in the Western Gulf Basin Province of the U.S. Gulf Coast region.
Authors
William H. Craddock, John W. Counts, Colin A. Doolan, Marc L. Buursink, Celeste D. Lohr, Javin J. Hatcherian, Katherine L. French, Jared T. Gooley, Phuong A. Le, Tracey J. Mercier, Cheryl A. Woodall, Christopher J. Schenk
Sulfur-to-iron ratio as a proxy for degree of organic sulfurization
The degree of organic sulfurization is broadly relevant yet underreported. We present a statistically significant correlation between whole rock S/Fe and the measured degree of organic sulfurization in the thermally immature Cenomanian–Turonian Eagle Ford Group. This relationship shows a sink switch for sulfur from pyrite to organic matter. Excess iron and excess sulfur relative to...
Authors
Katherine L. French, Justin E. Birdwell
An integrated perspective of paleoenvironmental change in the Western Interior Seaway before and during OAE-2 reveals how organic-rich mudstones form in dynamic environments
Organic and inorganic geochemistry was integrated with sedimentology from the Eagle Ford Group in the U.S. Geological Survey Gulf Coast-3 drill core to investigate why organic matter enrichment and anoxia predate the Cenomanian–Turonian oceanic anoxic event (OAE-2) at the southern Western Interior Seaway (WIS). The relationship between the degree of organic matter sulfurization and...
Authors
Katherine L. French, Jason Alan Flaum, Justin E. Birdwell
Assessment of undiscovered, technically recoverable conventional oil and gas resources in the Upper Jurassic Smackover Formation, U.S. Gulf Coast, 2022
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 143 million barrels of oil and 1,084 billion cubic feet of natural gas in conventional accumulations for the Upper Jurassic Smackover Formation in the onshore U.S. Gulf Coast region.
Authors
Justin E. Birdwell, Katherine J. Whidden, Stanley T. Paxton, Scott A. Kinney, Rand D. Gardner, Janet K. Pitman, Katherine L. French, Tracey J. Mercier, Cheryl A. Woodall, Heidi M. Leathers-Miller, Christopher J. Schenk
U.S. Geological Survey Rocky Mountain Region 2022 science exchange, showcasing interdisciplinary and state-of-the-art USGS science
IntroductionThe Rocky Mountains and the Colorado River Basin in the Western United States represent complex, interconnected systems that sustain a number of species, including tens of millions of humans. These systems face several challenges, including worsening drought, altered wildfire regimes, climate change, and the spread of invasive species. These factors can exacerbate one another...
Authors
Dana E. Peterson, Katherine L. French, Jeannette H. Oden, Patrick J. Anderson, Timothy N. Titus, Katharine G. Dahm, Jessica M. Driscoll, William J. Andrews
By
Natural Hazards Mission Area, Water Resources Mission Area, Ecosystems Mission Area, Energy Resources Program, Mineral Resources Program, Astrogeology Science Center, Central Energy Resources Science Center, Colorado Water Science Center, Fort Collins Science Center, Geosciences and Environmental Change Science Center, Geology, Geophysics, and Geochemistry Science Center
Report of the Science Community Workshop on the proposed First Sample Depot for the Mars Sample Return Campaign
The Mars 2020/Mars Sample Return (MSR) Sample Depot Science Community Workshop was held on September 28 and 30, 2022, to assess the Scientifically-Return Worthy (SRW) value of the full collection of samples acquired by the rover Perseverance at Jezero Crater, and of a proposed subset of samples to be left as a First Depot at a location within Jezero Crater called Three Forks. The primary...
Authors
Andrew D. Czaja, Maria-Paz Zorzano Mier, Gerhard Kminek, Michael Meyer, David Beaty, Elliot Sefton-Nash, Brandi Carrier, Fiona Thiessen, Timothy Haltigin, Audrey Bouvier, Nicolas Dauphas, Katherine L. French, Lydia Hallis, Rachel Harris, Ernst Hauber, Laura Rodriguez, Susanne P. Schwenzer, Andrew Steele, Kimberly Tait, Michael T. Thorpe, Tomohiro Usui, Jessica Vanhomwegen, Michael Velbel, Samuel Edwin, Kenneth A. Farley, Daniel Glavin, Andrea Harrington, Lindsay Hays, Aurore Hutzler, Meenakshi Wadhwa
Geochemistry of the Cretaceous Mowry Shale in the Wind River Basin, Wyoming
The siliceous nature of the Mowry Shale distinguishes it from many of the well-studied organic-rich mudstones of the Cretaceous Western Interior Seaway. Available models of organic enrichment in mudstones rarely incorporate detailed biomarker, bulk organic, inorganic, and mineralogy data. Here, we used these data to evaluate how variations in organic matter source, productivity, dilution...
Authors
Katherine L. French, Justin E. Birdwell, Paul G. Lillis
Biomarkers in the Precambrian: Earth’s ancient sedimentary record of life
The hydrocarbon remnants of biologically diagnostic lipids inform our understanding of Earth’s early ecosystems, particularly where morphological vestiges of biology are absent or ambiguous. Yet both the analysis and interpretation of ancient biomarkers require scrutinous approaches. Here, we describe the status quo of Precambrian biomarker geochemistry with four examples that highlight...
Authors
Christian Hallmann, Katherine L. French, Jochen J. Brocks
Carotenoid biomarkers in Namibian shelf sediments: Anoxygenic photosynthesis during sulfide eruptions in the Benguela Upwelling System
Anoxygenic photosynthesis by phototrophic sulfur bacteria is prevalent in microbial mat ecosystems and in restricted, highly stratified aquatic environments. This limited distribution reflects their simultaneous requirements for an anoxic habitat, reduced sulfur to supply electrons for carbon fixation, and an appropriate light regime. Although these conditions were often satisfied in...
Authors
Jian Ma, Katherine L. French, Xingqian Cui, Donald Bryant, Roger Summons
Assessment of undiscovered oil and gas resources in the Upper Cretaceous Austin Chalk and Tokio and Eutaw Formations, U.S. Gulf Coast, 2019
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 6.9 billion barrels of oil and 41.5 trillion cubic feet of natural gas in conventional and continuous accumulations in the Upper Cretaceous Austin Chalk and Tokio and Eutaw Formations onshore and in State waters of the U.S. Gulf Coast region.
Authors
Janet K. Pitman, Stanley T. Paxton, Scott A. Kinney, Katherine J. Whidden, Seth S. Haines, Brian A. Varela, Tracey J. Mercier, Cheryl A. Woodall, Christopher J. Schenk, Heidi M. Leathers-Miller, Ofori N. Pearson, Lauri A. Burke, Phuong A. Le, Justin E. Birdwell, Nicholas J. Gianoutsos, Katherine L. French, Ronald M. Drake, Thomas M. Finn, Geoffrey S. Ellis, Stephanie B. Gaswirth, Kristen R. Marra, Marilyn E. Tennyson, Chilisa M. Shorten
Comparability and reproducibility of biomarker ratio values measured by GC-QQQ-MS
The Norwegian Geochemical Standard North Sea Oil-1 was analyzed by gas chromatography triple quadrupole mass spectrometry (GC-QQQ-MS) on two instruments using independently developed analytical methods. Biomarker ratios determined by GC-QQQ-MS were compared to each other and to previously reported values determined by gas chromatography single quadrupole mass spectrometry (GC-Q-MS) or...
Authors
Katherine L. French, Arne Leider, Christian Hallmann
Trends in thermal maturity indicators for the organic sulfur-rich Eagle Ford Shale
Thermal maturity is critical to evaluate petroleum systems and to interpret biomarker results for paleoenvironmental and geobiology studies. Many thermal maturity indices were developed for marine source rocks containing type II kerogen, but their behavior in organic sulfur-rich source rocks requires more investigation. Here, we present geochemical analyses of whole and extracted rock...
Authors
Katherine L. French, Justin E. Birdwell, Michael Lewan
Science and Products
Geochemical data for the relationship between whole rock S/Fe and degree of organic sulfurization in the Eagle Ford Group
Geochemical data were generated from multiple thermally immature drill cores of the Eagle Ford Group across Texas. This data set accompanies a journal article that shows the relationship between whole rock S/Fe and degree of organic sulfurization across the thermally immature Eagle Ford in Texas. The data include LECO total carbon and total organic carbon, programmed pyrolysis, whole...
Geochemical data for the Cenomanian-Turonian Eagle Ford Group recorded in the USGS Gulf Coast 3 (GC-3) drill core of southwest Texas (ver. 1.1, April 2025)
The Upper Cretaceous Eagle Ford Group in southwest Texas represents a geologic record of the Cenomanian-Turonian period in the southern Western Interior Seaway (WIS) of North America prior to and during the Oceanic Anoxic Event 2 (OAE-2). Geochemical data generated and compiled here were collected on core samples taken from a wellbore near Del Rio, TX for the purpose of better...
Daily operating standard data used for verification of the Petroleum Geochemistry Research Laboratory Method for Qualitative Biomarker Analysis of Crude Oil and Rock Extracts by Gas Chromatography-Single Quadrupole Mass Spectrometry
The data release contains biomarker data generated by Gas Chromatography-Single Quadrupole Mass Spectrometry in the Petroleum Geochemistry Research Laboratory. The data was used to determine the precision and accuracy of one daily operating standard for the method entitled, "Petroleum Geochemistry Research Laboratory Method for Qualitative Biomarker Analysis of Crude Oil and Rock...
Data release for Geochemistry of the Cretaceous Mowry Shale in the Wind River Basin, Wyoming
This Data Release contains data associated with the journal article "Geochemistry of the Cretaceous Mowry Shale in the Wind River Basin, Wyoming";. Data include bulk organic geochemistry, major and trace element geochemistry, mineralogy, extractable organic matter composition, extractable biomarkers, and organic stable carbon isotope analyses.
Data Release for "Comparability and reproducibility of biomarker ratio values measured by GC-QQQ-MS"
This data release includes biomarker ratio values calculated from measurements made at the USGS for the reference oil NSO-1 that were reported in a journal article entitled Comparability and reproducibility of biomarker ratio values measured by GC-QQQ-MS (French et al., 2020). French, K.L., Leider, A., and Hallmann, C., 2020, Comparability and reproducibility of biomarker ratio values...
Geochemistry data for the USGS Gulf Coast #1 West Woodway core - A thermally immature core of the Eagle Ford Group in central Texas (ver. 1.1, April 2025)
Petroleum source rocks deposited during Cenomanian – Turonian time (late Cretaceous) are major generators of continuous and conventional oil and gas resources in the Gulf of Mexico Basin. The Eagle Ford Shale is a particularly important petroleum system and represents a substantial fraction of total oil and gas production in the United States. Significant lateral and vertical geochemical...
PGRL Method for Qualitative Biomarker Analysis by GC-MSD
This method identifies biomarkers in sedimentary organic matter, including rock extracts and petroleum, to provide insight into thermal maturity, depositional environment, reservoir characterization, oil-to-oil and oil-to-rock correlation, and source rock characterization.
This method identifies biomarkers in sedimentary organic matter, including rock extracts and petroleum, to provide insight into thermal maturity, depositional environment, reservoir characterization, oil-to-oil and oil-to-rock correlation, and source rock characterization.
Filter Total Items: 20
Assessment of undiscovered conventional and continuous oil and gas resources in the Escondido, Olmos, and San Miguel Formations of the Western Gulf Basin Province, U.S. Gulf Coast region, 2023
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 5 million barrels of oil and 25 billion cubic feet of gas in conventional reservoirs and 361 million barrels of oil and 10,978 billion cubic feet of gas in continuous reservoirs in the Western Gulf Basin Province of the U.S. Gulf Coast region.
Authors
William H. Craddock, John W. Counts, Colin A. Doolan, Marc L. Buursink, Celeste D. Lohr, Javin J. Hatcherian, Katherine L. French, Jared T. Gooley, Phuong A. Le, Tracey J. Mercier, Cheryl A. Woodall, Christopher J. Schenk
Sulfur-to-iron ratio as a proxy for degree of organic sulfurization
The degree of organic sulfurization is broadly relevant yet underreported. We present a statistically significant correlation between whole rock S/Fe and the measured degree of organic sulfurization in the thermally immature Cenomanian–Turonian Eagle Ford Group. This relationship shows a sink switch for sulfur from pyrite to organic matter. Excess iron and excess sulfur relative to...
Authors
Katherine L. French, Justin E. Birdwell
An integrated perspective of paleoenvironmental change in the Western Interior Seaway before and during OAE-2 reveals how organic-rich mudstones form in dynamic environments
Organic and inorganic geochemistry was integrated with sedimentology from the Eagle Ford Group in the U.S. Geological Survey Gulf Coast-3 drill core to investigate why organic matter enrichment and anoxia predate the Cenomanian–Turonian oceanic anoxic event (OAE-2) at the southern Western Interior Seaway (WIS). The relationship between the degree of organic matter sulfurization and...
Authors
Katherine L. French, Jason Alan Flaum, Justin E. Birdwell
Assessment of undiscovered, technically recoverable conventional oil and gas resources in the Upper Jurassic Smackover Formation, U.S. Gulf Coast, 2022
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 143 million barrels of oil and 1,084 billion cubic feet of natural gas in conventional accumulations for the Upper Jurassic Smackover Formation in the onshore U.S. Gulf Coast region.
Authors
Justin E. Birdwell, Katherine J. Whidden, Stanley T. Paxton, Scott A. Kinney, Rand D. Gardner, Janet K. Pitman, Katherine L. French, Tracey J. Mercier, Cheryl A. Woodall, Heidi M. Leathers-Miller, Christopher J. Schenk
U.S. Geological Survey Rocky Mountain Region 2022 science exchange, showcasing interdisciplinary and state-of-the-art USGS science
IntroductionThe Rocky Mountains and the Colorado River Basin in the Western United States represent complex, interconnected systems that sustain a number of species, including tens of millions of humans. These systems face several challenges, including worsening drought, altered wildfire regimes, climate change, and the spread of invasive species. These factors can exacerbate one another...
Authors
Dana E. Peterson, Katherine L. French, Jeannette H. Oden, Patrick J. Anderson, Timothy N. Titus, Katharine G. Dahm, Jessica M. Driscoll, William J. Andrews
By
Natural Hazards Mission Area, Water Resources Mission Area, Ecosystems Mission Area, Energy Resources Program, Mineral Resources Program, Astrogeology Science Center, Central Energy Resources Science Center, Colorado Water Science Center, Fort Collins Science Center, Geosciences and Environmental Change Science Center, Geology, Geophysics, and Geochemistry Science Center
Report of the Science Community Workshop on the proposed First Sample Depot for the Mars Sample Return Campaign
The Mars 2020/Mars Sample Return (MSR) Sample Depot Science Community Workshop was held on September 28 and 30, 2022, to assess the Scientifically-Return Worthy (SRW) value of the full collection of samples acquired by the rover Perseverance at Jezero Crater, and of a proposed subset of samples to be left as a First Depot at a location within Jezero Crater called Three Forks. The primary...
Authors
Andrew D. Czaja, Maria-Paz Zorzano Mier, Gerhard Kminek, Michael Meyer, David Beaty, Elliot Sefton-Nash, Brandi Carrier, Fiona Thiessen, Timothy Haltigin, Audrey Bouvier, Nicolas Dauphas, Katherine L. French, Lydia Hallis, Rachel Harris, Ernst Hauber, Laura Rodriguez, Susanne P. Schwenzer, Andrew Steele, Kimberly Tait, Michael T. Thorpe, Tomohiro Usui, Jessica Vanhomwegen, Michael Velbel, Samuel Edwin, Kenneth A. Farley, Daniel Glavin, Andrea Harrington, Lindsay Hays, Aurore Hutzler, Meenakshi Wadhwa
Geochemistry of the Cretaceous Mowry Shale in the Wind River Basin, Wyoming
The siliceous nature of the Mowry Shale distinguishes it from many of the well-studied organic-rich mudstones of the Cretaceous Western Interior Seaway. Available models of organic enrichment in mudstones rarely incorporate detailed biomarker, bulk organic, inorganic, and mineralogy data. Here, we used these data to evaluate how variations in organic matter source, productivity, dilution...
Authors
Katherine L. French, Justin E. Birdwell, Paul G. Lillis
Biomarkers in the Precambrian: Earth’s ancient sedimentary record of life
The hydrocarbon remnants of biologically diagnostic lipids inform our understanding of Earth’s early ecosystems, particularly where morphological vestiges of biology are absent or ambiguous. Yet both the analysis and interpretation of ancient biomarkers require scrutinous approaches. Here, we describe the status quo of Precambrian biomarker geochemistry with four examples that highlight...
Authors
Christian Hallmann, Katherine L. French, Jochen J. Brocks
Carotenoid biomarkers in Namibian shelf sediments: Anoxygenic photosynthesis during sulfide eruptions in the Benguela Upwelling System
Anoxygenic photosynthesis by phototrophic sulfur bacteria is prevalent in microbial mat ecosystems and in restricted, highly stratified aquatic environments. This limited distribution reflects their simultaneous requirements for an anoxic habitat, reduced sulfur to supply electrons for carbon fixation, and an appropriate light regime. Although these conditions were often satisfied in...
Authors
Jian Ma, Katherine L. French, Xingqian Cui, Donald Bryant, Roger Summons
Assessment of undiscovered oil and gas resources in the Upper Cretaceous Austin Chalk and Tokio and Eutaw Formations, U.S. Gulf Coast, 2019
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 6.9 billion barrels of oil and 41.5 trillion cubic feet of natural gas in conventional and continuous accumulations in the Upper Cretaceous Austin Chalk and Tokio and Eutaw Formations onshore and in State waters of the U.S. Gulf Coast region.
Authors
Janet K. Pitman, Stanley T. Paxton, Scott A. Kinney, Katherine J. Whidden, Seth S. Haines, Brian A. Varela, Tracey J. Mercier, Cheryl A. Woodall, Christopher J. Schenk, Heidi M. Leathers-Miller, Ofori N. Pearson, Lauri A. Burke, Phuong A. Le, Justin E. Birdwell, Nicholas J. Gianoutsos, Katherine L. French, Ronald M. Drake, Thomas M. Finn, Geoffrey S. Ellis, Stephanie B. Gaswirth, Kristen R. Marra, Marilyn E. Tennyson, Chilisa M. Shorten
Comparability and reproducibility of biomarker ratio values measured by GC-QQQ-MS
The Norwegian Geochemical Standard North Sea Oil-1 was analyzed by gas chromatography triple quadrupole mass spectrometry (GC-QQQ-MS) on two instruments using independently developed analytical methods. Biomarker ratios determined by GC-QQQ-MS were compared to each other and to previously reported values determined by gas chromatography single quadrupole mass spectrometry (GC-Q-MS) or...
Authors
Katherine L. French, Arne Leider, Christian Hallmann
Trends in thermal maturity indicators for the organic sulfur-rich Eagle Ford Shale
Thermal maturity is critical to evaluate petroleum systems and to interpret biomarker results for paleoenvironmental and geobiology studies. Many thermal maturity indices were developed for marine source rocks containing type II kerogen, but their behavior in organic sulfur-rich source rocks requires more investigation. Here, we present geochemical analyses of whole and extracted rock...
Authors
Katherine L. French, Justin E. Birdwell, Michael Lewan
USGS Location