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Strontium isotope record of paleohydrology and continental weathering, Eocene Green River Formation, Wyoming Sr isotope ratios in carbonate-rich lacustrine strata provide highly resolved and geographically specific records of past changes in weathering and regional drainage patterns. The Eocene Green River Formation is perhaps the best documented pre-Quaternary lacustrine unit in the world; therefore, these strata are ideally suited for studying the behavior of Sr. The 87Sr/86Sr ratios measured for primary carbonate in lake expansion- contraction cycles of the Laney Member are directly linked to changing lake facies. Four distinct cycles are preserved in a 6.4 m interval of the Arco Washakie Basin No. 1 core, each represented by a vertical succession of transgressive stromatolite facies containing dolomicritic intraclasts,... Categories: Publication; Types: Citation, Journal Citation; Tags: Geology, Laney Member, cycle, lake, strontium, All tags... weathering, Fewer tags