Reconstructing a Paleoflood History for the San Francisco Bay and Delta, California.

Authors: Michelle Goman*, Sonoma State University, B. Lynn Ingram, U.C. Berkeley, Frances Malamud-Roam, U.C. Berkeley
Topics: Paleoenvironmental Change, Earth Science, Physical Geography
Keywords: Paleoflood, San Francisco Bay, Paleoenvironment
Session Type: Paper
Day: 4/11/2018
Start / End Time: 10:00 AM / 11:40 AM
Room: Napoleon B2, Sheraton 3rd Floor
Presentation File: No File Uploaded

Sediment cores retrieved from freshwater and salt marsh tidal wetlands within the San Francisco Bay and Delta complex are important archives of paleoenvironmental change. Previous work has focused on reconstructing long-term climate and relative sea level changes. However, geologically short-term events such as floods, are also recorded within the wetlands, typically as inorganic rich layers that abruptly overly and interrupt the deposition of organic peats. Here we discuss stratigraphic and multiproxy analyses of a number cores from throughout the Bay and Delta region. Analyses include magnetic susceptibility, density, loss on ignition, carbon and sulphur isotopes, grain size and micro- and macro-botanical analyses. An event history is developed and placed within the context of regional climate records and evidence for extreme precipitation events in central and northern California.

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