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Frank Mathias, fmathias@kent Alison J. Smith Department of Geology Kent State University

A PLIO-PLEISTOCENE RECORD OF LACUSTRINE OSTRACODES FROM BUTTE VALLEY, CALIFORNIA: FAUNAL RESPONSES TO TECTONIC AND CLIMATIC CHANGE. Frank Mathias, fmathias@kent.edu Alison J. Smith Department of Geology Kent State University. Acknowledgments: USGS David Adams Claire Carter Rick Forester.

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Frank Mathias, fmathias@kent Alison J. Smith Department of Geology Kent State University

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  1. A PLIO-PLEISTOCENE RECORD OF LACUSTRINE OSTRACODES FROM BUTTE VALLEY, CALIFORNIA: FAUNAL RESPONSES TO TECTONIC AND CLIMATIC CHANGE Frank Mathias, fmathias@kent.edu Alison J. Smith Department of Geology Kent State University

  2. Acknowledgments: USGS David Adams Claire Carter Rick Forester

  3. N NANODe North American Non-Marine Ostracode Database Version 1 Forester et al., 2005 www.kent.edu/NANODe

  4. 1 km

  5. Butte Valley cross-section, (Woods, 1960)

  6. Sedimentation rate diagram; Butte Valley core (Roberts et al., 1996)

  7. Butte Valley Core Brunhes 0.78 my Jaramillo 1.06 my Olduvai 2.0 my Matuyama 2.59 my 2.59 Gauss 3.05 KAENA 3.12 3.22 MAMMOTH 3.33

  8. Gauss Cytherissa lacustris Tuberocypris brighti Lowest Assemblage

  9. L. platyforma Brunhes L. sappaensis 0.78 my Matuyama 2.59 my Gauss Upper Assemblage L. certiotuberosa

  10. All NANODe sites Bicarb. enrichment Log (HCO3/Ca) meq/l Bicarb. depletion Log TDS mg/l

  11. Cluster 2-with photos of key sp

  12. ca 0.78 my ca 2.1 my ca 3.3 my Log HCO3/Ca (meq/l) Log TDS mg/l

  13. In the late-Pliocene, and likely long before, a stable, permanent freshwater lake existed in Butte Valley as indicated by the presence of syngamicC. lacustris. • Plio/Pleistocene tectonic forces (extension and uplift) coincident with a shift in paleoclimate in the western U.S. amplified effects on lake hydrochemistry through the Pleistocene. • Ostracodes tracked this hydrochemical shift and provide a window into the tectonic and climatic changes in the lake through time.

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