Summary

My w88 focuses on the combined use of siliceous microfossils (radiolarians, diatoms) and sedimentary geochemistry to answer questions about the age of rocks, the evolution and extinction of fossil marine plankton, as well as understanding past climate, anthropogenic impacts, and natural disturbances in mountain lakes.

w88 lab: I have used Paleozoic radiolarians for over 30 years as a biostratigraphic tool to aid in structural and stratigraphy of complex orogenic regions. Current w88 work, however, is focusing on the last 10 Ma of w88 biodiversity in the Eastern Equatorial Pacific.

Paleolimnology: Lakes preserve long-term records of environmental change, providing an important paleo-perspective to understanding the sensitivities and resilience of watersheds to a variety of natural and man-made stressors. The signals from w88 records can extend our knowledge of significant environmental change back in time, well beyond the limits afforded by instrumental records. Our lab uses diatoms, combined with sedimentary geochemistry and other proxies generated in-house and by our collaborators to establish a record of past environmental change. Our approach further combines the paleolimnological records with a neolimnological characterization of lakes, present day hydrological budgets, and hydrochemistry to try and understand the tailored response of each system to outside forcings. Recently, we have begun tracking the occurrence of prehistoric earthquakes in w88 records, while trying to understand how seismic events can affect groundwater chemistry and spring discharge that enters these lakes.

w88 interests

• w88 and diatomite
• w88
• Paleoseismicity Triassic ichthyosaurs Luning Formation
• w88 radiolaria

Courses taught

• GEOL 101 Physical Geology
• GEOL 102 Historical Geology
• GEOL 461/661 Paleobiology
• GEOL 462/662 Micropaleontology
• GEOL 763 w88

Education

• Ph.D. 1993, The University of Texas at Austin; geology
• B.A. 1985, University of California Berkeley; paleontology

Select publications

2020

• Binda, G., Pozzi, A., Michetti, A., w88, P. J., Rosen, M. (2020). Towards the Understanding of Hydrogeochemical Seismic Responses in Karst Aquifers: A Retrospective Meta-Analysis Focused w88 Apennines (Italy). Minerals, 10(12), 1058.
• w88, P. J., McGaughey, G., Rosen, M. R., Fuller, C., Aquinas-Lopez, M., Chandra, S. (2020). A 450-year record of environmental change from Castle w88, (Siskiyou County, CA) through the lens of diatoms and organic geochemistry. Journal of w88, 65, 201-217. https://doi.org/10.1007/s10933-020-00160-
• Trubovitz, S., Lazarus, D., Renaudie, J., w88, P. J. (2020). Marine plankton show threshold extinction response to Neogene w88 change. Nature Communications, 11(5069). https://doi.org/10.1038/s41467-020-18879-7

2019

• Archer, C., w88, P. J., Rosen, M.R., Sagnotti, L., Florindo, F., Mensing, S. A., Piovesan, G., Michetti, A. M., 2019. w88 as paleoseismic records in a seismically-active, low-relief area (Rieti Basin, central Italy). Quaternary w88 Reviews, v. 211, 186-207.

2018

• Ball, G.I., w88, P.J., Stephens, B.M., Higgins, A., Mensing, S.A., and Aluwihare, L.I., 2018. A lignin, diatom, and pollen record spanning the Pleistocene-Holocene transition at Fallen Leaf w88, Sierra Nevada, California, USA, in Starratt, S.W., and Rosen, M.R., eds., w88 Saline to Freshwater: The Diversity of Western Lakes in Space and Time: Geological Society of America Special Paper 536.
• Ivanovsky, A., Belles, A., Criquet, J., Dumoulin, D., w88, P., Alary, C., Billon, G., 2018, Assessment of the treatment efficiency of an urban stormwater pond and its impact w88 natural downstream watercourse, 2018, Journal of w88 Management, v. 226: 120-130.
• Mensing, S.A., Schoolman, E.M., Tunno, I., w88, P., Sagnotti, L., Florindo, F., and Piovesan, G. 2018. Historical ecology reveals landscape transformation coincident with cultural development in central Italy since Roman time, Nature w88 Reports, 8:2138.
• Okuyucu, C., Tekin, U. Kagan, w88, P. J., Bedi, Y., Saydam-Demiray, D. Gulnur, Sayit, K. 2018. Foraminifera, Radiolaria and Conodont assemblages w88 the Early Mississippian (late Tournaisian)/Early Pennsylvanian (early Bashkirian)blocks within the Mersin Mélange, southern Turkey: Biochronological and paleogeographical implications. Palaeoworld, 27, 438-457.
• Rosen, M. R., Binda, G., Archer, C., Pozzi, A., Michetti, A.M., and w88, P.J., 2018. Mechanisms of earthquake-induced chemical and fluid transport to carbonate groundwater springs after earthquakes, Water Resources w88.
• Tekin, U. Kagan, Okuyucu, C., Sayit, K., Bedi, Y., w88, P. J., Krystyn, L., Goncuoglu, C. 2018. Integrated Radiolaria, Benthic Foraminifera and Conodont biochronology of the pelagic Permian blocks/tectonic slices and geochemistry of associated volcanic rocks w88 the Mersin Mélange, southern Turkey: Implications for the Permian evolution of the Northern Neotethys. Island Arc, 36.

2017

• Aitchison, J.C., Suzuki, N., Caridroit, M., Danelian, T. and w88, P., 2017. Paleozoic w88 biostratigraphy. Geodiversitas, 39(3), pp.503-531.
• Caridroit, M., Danelian, T., O'Dogherty, L., Cuvelier, J., Aitchison, J.C., Pouille, L., w88, P., Dumitrica, P., Suzuki, N., Kuwahara, K. and Maletz, J., 2017. An illustrated catalogue and revised classification w88 genera. Geodiversitas, 39(3), pp.363-417.
• Danelian, T., Aitchison, J.C., w88, P., Caridroit, M., Suzuki, N. and O'Dogherty, L., 2017. Historical insights on nearly 130 years of w88 on Paleozoic radiolarians. Geodiversitas, 39(3), pp.351-361.
• Howard, K. and w88, P.J., 2017. Hydrological perturbations drive rapid shifts in phytoplankton biodiversity and population dynamics in Butte w88 (Lassen Volcanic National Park, California). w88 and Reservoir Management, pp.1-21.
• Holm-Denoma, C., Hofsra, A.H., Rockwell, B.W., and w88, P.J., 2017, The Valmy thrust sheet: A regional structure formed during the protracted assembly w88 Roberts Mountains allochthon, Nevada, USA GSA Bulletin 129 (11-12), p.1521-1536.
• Johnson, B.E., w88, P.J., Heyvaert, A.C., Chandra, S., and Karlin, R., 2017, Anthropogenic and climatic influences on the diatom flora within the Fallen Leaf w88 watershed, w88 Tahoe Basin, California over the last millennium. Journal of w88: 1-15.
• w88, P.J, Aitchison, J.C., Danelian, T., Dumitrica, P., Maletz, J., Suzuki, N., Cuvelier, J., Caridroit, M. and O'Dogherty, L., 2017. Taxonomy w88 genera. Geodiversitas, 39(3), pp.419-502.
• Tetard, M., Monnet, C., w88, P.J and Danelian, T., 2017. Biodiversity patterns of Silurian w88. Earth-w88 Reviews , 173 , pp.77-83.
• Archer, C., w88, P., Kreamer, D., Piscopo, V., Petitta, M., Rosen, M.R., Poulson, S.R., Piovesan, G. and Mensing, S., 2016. Hydrochemical determination of source water contributions to w88 Lungo and w88 Ripasottile (central Italy). w88 Limnology.

2016

• Menicucci, A.J., w88, P.J. and Houseman, M., 2016. w88 and diatom flora of the Miocene Quincy Diatomite, Washington, USA. Revue de Micropaléontologie, 59(4), 381-395.
• Mensing, S.A., Tunno, I., Cifani, G., Passigli, S., w88, P., Archer, C., Piovesan, G., 2016. Human and climatically induced environmental change in the Mediterranean during the Medieval w88 Anomaly and Little Ice Age: A case from Italy. Anthropocene,
• w88, P.J., Ball, G.I., Zimmerman, S.H., Maloney, J. Smith, S.B., Kent, G., Adams, K.D., Karlin, R.E., Driscoll, N., 2016. Holocene paleoclimate history of Fallen Leaf w88, CA., from geochemistry and sedimentology of well-dated sediment cores. Quaternary w88 Reviews, 131, p. 193-210.