The DOI matches its Crossref record; 34 of the 41 references it cites were found in a registry or an index.
Differences in Radiocarbon Age between Shell and Charcoal from a Holocene Shellmound in Northern California
Abstract
The West Berkeley shellmound, the oldest well-dated archaeological site in the San Francisco Bay region, contains shell and charcoal ranging in age from ca. 1200 to 5700 cal yr B.P. Radiocarbon ages of marine shell and charcoal collected from fifteen stratigraphic levels in the West Berkeley shellmound suggest changes in the 14C content of San Francisco Bay surface waters relative to the atmosphere (the oceanic reservoir age) over the past 5000 yr. The reservoir age of San Francisco Bay waters fluctuated between 870 and −170 14C yr over the past 5000 yr, with the lowest values occurring 2900 to 3800 cal yr B.P. and the highest values between 1200 and 2000 cal yr B.P. Changes in the radiocarbon reservoir age may be due to changes in the strength of seasonal wind-driven upwelling off coastal California, where upwelling brings 14C-depleted waters to the surface. The period of lowest ΔR values (at 3500 to 3900 cal yr B.P.) is coincident with relatively low salinity in San Francisco Bay (indicating high freshwater inflow) and wet climate in California based on lake level records. The period of high ΔR values (1200–2000 cal yr B.P.) is coincident with one of the driest periods in California during the late Holocene. These data suggest a link between coastal upwelling and precipitation over central California. The age of the top of West Berkeley mound and several other mounds in the San Francisco Bay region (1100 to 1300 cal yr B.P.) coincides with a prolonged dry period in California and low river inflow to San Francisco Bay. Perhaps the sites were abandoned because of the drought.
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Metadata
- Authors
- Ingram, B. L.
- Affiliations
- University of California, Berkeley (US)
- Corresponding author
- Ingram, B. Lynn
- Venue
- Quaternary Research
- Publisher
- Cambridge University Press (CUP)
- Published
- 1998-01
- Volume
- 49
- Issue
- 1
- Pages
- 102-110
- ISSN
- 0033-5894 (ISSN-L)
- 1096-0287
- OpenAlex
- W2073300235
- Cited by
- 91
- References
- 41
- Citations by year
- 2024: 2 · 2023: 3 · 2022: 6 · 2021: 3 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 3 · 2016: 2 · 2015: 5 · 2014: 1 · 2013: 1 · 2012: 3
- FWCI
- 6.89
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Quaternary Research (publishedVersion)
- Topics
- Social Sciences › Archeology › Archaeology and ancient environmental studies
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Social Sciences › Arts and Humanities › Archeology (arts and humanities) › Maritime and Coastal Archaeology
- Keywords
- radiocarbon reservoir age, marine shells, charcoal, San Francisco Bay, Holocene, coastal upwelling, California Current, freshwater discharge, late Holocene drought, site abandonment, San Francisco Bay region
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