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Carbon isotopic composition of individual biomarkers in gilsonites (Utah) Carbon isotopic compositions of saturated hydrocarbon, aromatic hydrocarbon, NSO (resin), and asphaltene fractions of vein-forming gilsonites (Cowboy, Bonanza, Independence, Wagonhound and Harrison veins) in the NE Uinta Basin, Utah, are all similar and isotopically resemble Mahogany Zone shale extracts of the Green River Formation (δ 13C −29 to −31%). Individual molecular fossils in the gilsonites show a wider variability in compositions indicative of their paleoecological origins within the Eocene Uinta/Greater Green River paleolake system. Carbon isotopic compositions of C28 and C29 steranes (δ 13C = −25 to −32%), pristance and phytane (−33 to —34%) and perhydroβ-carotene (carotane) (δ 13C = −33.2%) suggest that... Categories: Publication; Types: Citation, Journal Citation; Tags: Organic Geochemistry, carotane, compound-specific carbon isotope ratios, gilsonite, green river formation, All tags... hopane, lexane, mahogany zone, methylotrophs, moretane, piceance creek basin, sterane carbon isotope ratios, uinta basin, utah, Fewer tags Synoptic reconstruction of a major ancient lake system: Eocene Green River Formation, western United States Numerous 40Ar/39Ar experiments on sanidine and biotite from 22 ash beds and 3 volcaniclastic sand beds from the Greater Green River, Piceance Creek, and Uinta Basins of Wyoming, Colorado, and Utah constrain ~8 m.y. of the Eocene Epoch. Multiple analyses were conducted per sample using laser fusion and incremental heating techniques to differentiate inheritance, 40Ar loss, and 39Ar recoil. When considered in conjunction with existing radioisotopic ages and lithostratigraphy, biostratigraphy, and magnetostratigraphy, these new age determinations facilitate temporal correlation of linked Eocene lake basins in the Laramide Rocky Mountain region at a significantly increased level of precision. To compare our results... Categories: Publication; Types: Citation, Journal Citation; Tags: Ar-Ar, Geological Society of America Bulletin, Green River Formation, Piceance Creek Basin, Uinta Basin, All tags... absaroka, eocene, lake type, land-mammal ages, laramide, Fewer tags