{"action":"create","ckan_id":null,"date_created":"Sat, 14 Feb 2026 20:36:32 GMT","date_finished":null,"harvest_job_id":"e0f41b31-a68d-43ff-8093-27a46dae0336","harvest_source_id":"31f41541-38a0-400b-b240-10ebcb0acd9a","id":"ce8ef2c9-6739-4714-a274-6804ecd0ce5c","identifier":"https://dggs.alaska.gov/webpubs/metadata/RDF2025-31.xml","parent_identifier":null,"source_hash":"5fbbc9331cc52cd1216c49184fb509f6b008afdcd646f0df2ef2c50ea849d621","source_raw":"Qureshi, K.A.Baseline Resolution Inc.Weatherford Laboratories2025Rock-Eval pyrolysis, vitrinite reflectance, and kerogen microscopy analytical results from Eocene to Pliocene strata in the Susitna Basin, Kenai Peninsula, and Kachemak Bay, Cook Inlet, AlaskaspreadsheetRaw Data FileRDF 2025-31Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys64 p.https://doi.org/10.14509/31800Rock-Eval pyrolysis, vitrinite reflectance, and kerogen microscopy analytical results from Eocene to Pliocene strata in the Susitna Basin, Kenai Peninsula, and Kachemak Bay, Cook Inlet, Alaska, Raw Data File 2025-31, provides analytical results from Rock-Eval pyrolysis, vitrinite reflectance, and kerogen microscopy performed on 51 outcrop samples collected across the Cook Inlet region, including the Susitna Basin, Kenai Peninsula, and Kachemak Bay. These samples were obtained during DGGS Energy Resources Section field campaigns conducted in 2006, 2007, and 2009 to evaluate regional geology and hydrocarbon potential. Eight samples were analyzed by Rock-Eval pyrolysis, and vitrinite reflectance and kerogen microscopy were completed for the full sample set. The samples represent five stratigraphic units: six from the West Foreland Formation, six from the Hemlock Conglomerate, 18 from the Tyonek Formation, 15 from the Beluga Formation, and six from the Sterling Formation. Rock-Eval pyrolysis supports assessment of hydrocarbon-generative potential and thermal maturity. Vitrinite reflectance and kerogen microscopy provide complementary indicators of organic matter type and thermal evolution. Together, these datasets contribute to a more comprehensive understanding of source rock characteristics and maturation history within the Cook Inlet petroleum system. These data are provided as a Raw Data File under an open end-user license and are available on the DGGS website: http://doi.org/10.14509/31800.This data release supports evaluation of source rock quality and thermal maturity in the Cook Inlet region by providing new geochemical and organic petrology analyses. These data strengthen Alaska's regional resource assessments, reduce exploration uncertainty, and inform energy-related decisions that contribute to the state's long-term economic and energy security.>Rock-Eval data: Table of identification numbers, coordinates, station and sample descriptions, Rock-Eval analytical results, and an accompanying data dictionary.\t\r\n>Vitrinite reflectance data: Table of identification numbers, coordinates, station and sample descriptions, vitrinite reflectance analytical results, and an accompanying data dictionary.\t\r\n>Visual kerogen data: Table of identification numbers, coordinates, station and sample descriptions, visual kerogen analytical results, and an accompanying data dictionary.20062009ground conditionCompleteNone planned-152.032280-150.80765561.38630559.442888ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAnalysesBasin AnalysisBasinsBedrockClaystoneCoalConglomerateDGGSEnergyEnergy ResourcesExplorationFormationsGasGas BasinsGeochemical DataGeochemistryGeologyHydrocarbonHydrocarbon ExplorationHydrocarbon PotentialKerogenKerogen MicroscopyMethodsMudstoneOil and GasOil and Gas BasinOil BasinsOil DevelopmentOrganic GeochemistryOutcropOutcrop SamplesPetrified WoodPetrogenesisPetrographicPetrographyPetroleumPetroleum Basin StudyPetroleum GeologyPetroleum SystemsPetrologyPyrolysisResourcesRock-Eval PyrolysisRocksSandstoneSedimentarySedimentary RocksSideriteSiltstoneSource Rock EvaluationSource RocksStratigraphyThermal MaturityVisual KerogenVitriniteVitrinite ReflectanceAlaska Division of Geological & Geophysical SurveysBeluga RiverBishop CreekCapps CreekChichantna RiverChigmit MountainsChuitna RiverCook InletDeep CreekFalls CreekHomer Mining DistrictKachemak BayKenai PeninsulaLewis RiverLigniteNorth Capps CreekRedoubt Mining DistrictSouthcentral AlaskaSusitna BasinTheodore RiverAlaska Division of Geological & Geophysical SurveysBeluga FormationHemlock ConglomerateSterling FormationTyonek FormationWest Foreland FormationWalker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of AmericaEocenePlioceneThis report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.Alaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical
3354 College Road
FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.Capital Improvement Projects funded the DGGS Cook Inlet Basin Analysis Program from the State of Alaska. Benchmark Oil and Gas, Pioneer Natural Resources Alaska, Inc., and Chevron North America Exploration and Production Company generously provided additional support. We gratefully thank the Cook Inlet Region Incorporation (CIRI), Tyonek Native Corporation, and the Kenai National Wildlife Refuge for permitting land access. We thank the field geologists who collected most of the samples used in this study, Simone Montayne for her assistance with data compilation, and Erin Campbell for her review.Finzel, E.S.Gillis, R.J.Ridgway, K.D.LePain, D.L.2009Preliminary evaluation of basin margin exhumation and provenance of Cenozoic strata, Chuitna and Beluga rivers area, Cook Inlet forearc basin, AlaskaPreliminary Interpretive ReportPIR 2009-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys16 phttps://doi.org/10.14509/19641Freeman, L.K.Gillis, R.J.Elliott, B.A.Wypych, Alicja2016Major-oxide and trace-element geochemical data from rocks collected in 2010 in the Tyonek Quadrangle, AlaskaRaw Data FileRDF 2016-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys2 phttps://doi.org/10.14509/29651Gillis, R.J.Benowitz, J.A.O'Sullivan, P.B.Layer, P.W.Wartes, M.A.2017Zircon U-Pb and 40Ar/39Ar results from dikes collected within the Bruin Bay fault zone, lower Cook InletRaw Data FileRDF 2017-7Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys14 phttps://doi.org/10.14509/29750Gillis, R.J.2013Overview of 2012 field studies: Upper Alaska Peninsula and west side of lower Cook Inlet, AlaskaPreliminary Interpretive ReportPIR 2013-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys48 phttps://doi.org/10.14509/24824Gillis, R.J.2014Cook Inlet program 2013 field studies: Observations and preliminary interpretations from new 1:63,360-scale geologic mapping of the Iniskin Peninsula, lower Cook Inlet, AlaskaPreliminary Interpretive ReportPIR 2014-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys31 phttps://doi.org/10.14509/27303Gillis, R.J.LePain, D.L.Ridgway, K.D.Finzel, E.S.2009A reconnaissance view of an unnamed fault near Capps Glacier, northwestern Cook Inlet basin, and its potential as a regional-scale, basin-controlling structurePreliminary Interpretive ReportPIR 2009-3Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys9 phttps://doi.org/10.14509/19503Gillis, R.J.Wartes, M.A.Herriott, T.M.LePain, D.L.Benowitz, J.A.Wypych, AlicjaDonelick, R.A.O'Sullivan, P.B.Layer, P.W.202240Ar/39Ar and U-Pb geochronology of Cretaceous-Paleocene igneous rocks and Cenozoic strata of northwestern Cook Inlet, Alaska: Linkages between arc magmatism, cooling, faulting, and forearc subsidenceProfessional ReportPR 125 v. 1.1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys78 phttps://doi.org/10.14509/30554Gregersen, L.S.Shellenbaum, D.P.2016Top Mesozoic unconformity subcrop map, Cook Inlet basin, AlaskaReport of InvestigationRI 2016-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:500,000https://doi.org/10.14509/29658Helmold, K.P.LePain, D.L.Wilson, M.D.Peterson, C.S.2013Petrology and reservoir potential of Tertiary and Mesozoic sandstones, Cook Inlet, Alaska: A preliminary analysis of outcrop samples collected during 2007-2010 field seasonsPreliminary Interpretive ReportPIR 2013-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys34 phttps://doi.org/10.14509/25035Herriott, T.M.Wartes, M.A.2014Geologic-mapping-based observations of the Middle Jurassic Chinitna Formation and Upper Jurassic Naknek Formation in the Tilted Hills, Iniskin Peninsula, Cook Inlet, AlaskaPreliminary Interpretive ReportPIR 2014-3Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys23 phttps://doi.org/10.14509/27305Herriott, T.M.Wartes, M.A.2017Discovery of a 35-meter-thick, oil-stained sandstone interval in outcrop of the Tonnie Siltstone Member, Chinitna Formation, lower Cook Inlet, south-central AlaskaPreliminary Interpretive ReportPIR 2017-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys12 phttps://doi.org/10.14509/29837Herriott, T.M.2016Petroleum-related geologic studies in lower Cook Inlet during 2015, Iniskin-Tuxedni region, south-central AlaskaPreliminary Interpretive ReportPIR 2016-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys78 phttps://doi.org/10.14509/29532Herriott, T.M.Nye, C.J.Reger, R.D.Wartes, M.A.LePain, D.L.Gillis, R.J.2014Geologic context, age constraints, and sedimentology of a Pleistocene volcaniclastic succession near Mount Spurr volcano, south-central AlaskaReport of InvestigationRI 2014-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys35 phttps://doi.org/10.14509/27261Herriott, T.M.Wartes, M.A.Decker, P.L.2017Deep-water canyons and sequence-stratigraphic framework of the Upper Jurassic Naknek Formation, south-central AlaskaReport of InvestigationRI 2017-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys53 phttps://doi.org/10.14509/29707Herriott, T.M.Wartes, M.A.O'Sullivan, P.B.Gillis, R.J.2019Detrital zircon maximum depositional dates for the Jurassic Chinitna and Naknek Formations, lower Cook Inlet, Alaska: A preliminary viewPreliminary Interpretive ReportPIR 2019-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys11 phttps://doi.org/10.14509/30180Hickey, J.J.Wilson, M.D.Reifenstuhl, R.R.2007Petrographic study of 50 samples from the Tertiary sandstone of Cook Inlet, Alaska: potential tight gas reservoirsReport of InvestigationRI 2007-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys64 phttps://doi.org/10.14509/15774LePain, D.L.2009Preliminary results of recent geologic investigations in the Homer-Kachemak Bay area, Cook Inlet basin: Progress during the 2006-2007 field seasonPreliminary Interpretive ReportPIR 2009-8Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys187 phttps://doi.org/10.14509/20161LePain, D.L.Lillis, P.G.Helmold, K.P.Stanley, R.G.2012Migrated hydrocarbons in exposure of Maastrichtian nonmarine strata near Saddle Mountain, lower Cook Inlet, AlaskaReport of InvestigationRI 2012-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys13 phttps://doi.org/10.14509/23943LePain, D.L.Stanley, R.G.Helmold, K.P.2020Deepwater mass-transport complex in the Upper Jurassic Pomeroy Arkose Member, Naknek Formation, Chinitna Bay, Alaska: The depositional record of co-genetic slumps and debris flows in a slope to proximal basin floor settingReport of InvestigationRI 2020-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys31 phttps://doi.org/10.14509/30464Loveland, A.M.PetroTech Associates2013Mercury injection capillary pressure results from outcrop samples in the Indecision Creek Member of the Naknek Formation and the Kaguyak Formation type sectionRaw Data FileRDF 2013-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys4 phttps://doi.org/10.14509/24916Loveland, A.M.PetroTech Associates2013Mercury injection capillary pressure (MICP) results from outcrop samples in the Tyonek, Beluga, and West Foreland formations, Tyonek and Talkeetna quadrangles, AlaskaRaw Data FileRDF 2013-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys5 phttps://doi.org/10.14509/25299Loveland, A.M.PetroTech Associates2013Mercury injection capillary pressure (MICP) results from outcrop samples in the Naknek Formation, Iniskin Peninsula, AlaskaRaw Data FileRDF 2013-6Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys10 phttps://doi.org/10.14509/25494Loveland, A.M.PetroTech Associates2014Mercury injection capillary pressure results from outcrop samples in the Kaguyak, Naknek, and West Foreland formations, Iniskin Peninsula region, AlaskaRaw Data FileRDF 2014-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys5 phttps://doi.org/10.14509/27021Reger, R.D.2009Reinterpretation of the Kaloa deposits near Granite Point, northwestern Cook Inlet, AlaskaPreliminary Interpretive ReportPIR 2009-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys8 phttps://doi.org/10.14509/18241Rosenthal, J.L.Betka, P.M.Gillis, R.J.Nadin, E.S.2018Fracture intensity of the Mesozoic sedimentary forearc strata of lower Cook Inlet, AlaskaReport of InvestigationRI 2018-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys38 phttps://doi.org/10.14509/30063Shellenbaum, D.P.Gregersen, L.S.Delaney, P.R.2010Top Mesozoic unconformity depth map of the Cook Inlet basin, AlaskaReport of InvestigationRI 2010-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:500,000https://doi.org/10.14509/21961Wartes, M.A.2015Energy-related studies during the 2014 field season, western Cook Inlet, AlaskaPreliminary Interpretive ReportPIR 2015-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys62 phttps://doi.org/10.14509/29455Wypych, AlicjaGillis, R.J.Betka, P.M.Decker, P.L.2016Major-oxide and trace-element geochemical data from rocks collected in 2015 in lower Cook Inlet, Iniskin - Tuxedni region, AlaskaRaw Data FileRDF 2016-3Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys2 phttps://doi.org/10.14509/29575Zippi, P.A.Loveland, A.M.2012Palynological analysis of 228 outcrop samples from the Kenai, Seldovia, and Tyonek quadrangles, Cook Inlet region, AlaskaRaw Data FileRDF 2012-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys10 phttps://doi.org/10.14509/23723Zippi, P.A.Gillis, R.J.Montayne, SimoneLoveland, A.M.2021Palynological and thermal maturity analysis of outcrop samples from the Kenai, Seldovia, and Tyonek quadrangles, Cook Inlet region, AlaskaRaw Data FileRDF 2021-8Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys4 phttps://doi.org/10.14509/30660The accompanying report and data tables provide a comprehensive discussion of processing methods, with errors reported in the tables where applicable. This data is being released as part of the DGGS RDF series, which includes content describing approved techniques and methods for the collection, storage, visualization, analysis, and interpretation of scientific data. While the information has been reviewed by several geologists familiar with the study area, the data and report have not undergone formal review for technical content or conformity to DGGS editorial standards. For inquiries regarding analytical values or procedures, the originating lab is the best point of contact.Not applicableThis data release is complete.Sample location coordinates were obtained using recreational-grade GPS units, with a typical reported accuracy of about 10 meters. Coordinates were collected using the NAD27 datum. Coordinate conversion was performed from NAD27 to NAD83 using ArcGIS Pro. Each sample number corresponds to the measured section number and the sample position (meters above base of section) within each measured section. Coordinates refer to the base of the measured section.Sample collection - DGGS field geologists collected samples from surface outcrops for Rock-Eval pyrolysis, vitrinite reflectance, and kerogen microscopy analyses. Sample location coordinates were obtained using recreational-grade GPS units, with a typical reported accuracy of about 10 meters. Coordinates were collected using the NAD27 datum. Coordinate conversion was performed from NAD27 to NAD83 using ArcGIS Pro. Each sample number corresponds to the measured section number and the sample position (meters above base of section) within each measured section. Coordinates refer to the base of the measured section2009Sample analysis - Eight outcrop samples were sent to Weatherford Laboratories in Houston, Texas, for Rock-Eval pyrolysis analysis. The samples analyzed include coal, carbonaceous mudstone, and siltstone. Thirty-two outcrop samples were sent to Baseline Resolution, Inc. in Shenandoah, Texas and 19 to Weatherford Laboratories in Houston, Texas. The labs employed standardized methods for vitrinite reflectance analysis of coal and dispersed vitrinite in sedimentary rocks, following ASTM protocols D2798-11a and D7708-14 (2015). Vitrinite reflectance samples were also evaluated using kerogen microscopy, also known as visual kerogen analysis. Additional details on laboratory methods and data reduction are provided in the accompanying report.2009point0.00000010.0000001decimal degreesNAD83GRS 806378137298.257222101rdf2025_31_rock-eval-data.csv, rdf2025_31_rock-eval-data-dictionary.csvTable of identification numbers, coordinates, station and sample descriptions, Rock-Eval analytical results, and an accompanying data dictionary.DGGSRock-Eval datardf2025_31_visual-kerogen-data.csv, rdf2025_31_visual-kerogen-data-dictionary.csvTable of identification numbers, coordinates, station and sample descriptions, vitrinite reflectance analytical results, and an accompanying data dictionary.DGGSVitrinite reflectance datardf2025_31_vitrinite-reflectance-data.csv, rdf2025_31_vitrinite-reflectance-data-dictionary.csvTable of identification numbers, coordinates, station and sample descriptions, visual kerogen analytical results, and an accompanying data dictionary.DGGSVisual kerogen dataAlaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical
3354 College Road
FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.RDF 2025-31The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount.Contact DGGS for current pricingspreadsheet20251229tablehttps://doi.org/10.14509/31800Free download20251229Alaska Division of Geological & Geophysical SurveysSimone MontayneMetadata Managermailing and physical
3354 College Road
FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysFGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys.https://dggs.alaska.gov/metadata/dggs.extdggs metadata extensions","source_transform":null,"status":"error"}