Abrupt Late Holocene Closure of San Elijo Lagoon, Northern San Diego County, California
Abstract
:1. Introduction
1.1. Background
1.1.1. General Setting
1.1.2. Geologic Setting
2. Methods
2.1. Sample Collection
2.2. Radiocarbon Analysis
3. Results
3.1. Sediment Analysis Results
3.2. Radiocarbon Results
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sample Core # | Description of Sample | Depth of Sample (cm) | Material/ Pretreatment | Measured Radiocarbon Age (ybp) | 13C/12C Ratio | Conventional Radiocarbon Age (*) (ybp) | Calibrated Calendar Age |
---|---|---|---|---|---|---|---|
106 | DG-OS | 35.6–45.7 | OS AW | 1160 ± 40 | −23.6‰ | 1180 ± 40 | AD 770 ± 40 |
120 | DG-OS | 38.1–49.5 | OS AW | 1940 ± 40 | −24.4‰ | 1950 ± 40 | AD 0 ± 40 |
124 | DG-OS | 50.8–61.0 | OS AW | 520 ± 40 | −24.9‰ | 520 ± 40 | AD 1430 ± 40 |
127 | DG-SSS | 22.9–31.8 | Shell AE | 640 ± 40 | +1.7‰ | 1080 ± 40 | AD 870 ± 40 |
128 | DG-OS | 71.1–91.4 | OS AW | 730 ± 40 | −25.1‰ | 730 ± 40 | AD 1220 ± 40 |
133 | DG-SSS | 20.3–40.6 | Shell AE | 1090 ± 40 | −0.6‰ | 1490 ± 40 | AD 460 ± 40 |
133 | DG-OS | 48.3–61.0 | CS AAA | 310 ± 50 | −19.5‰ | 400 ± 50 | AD 1550 ± 50 |
136 | DG-OS | 25.4–34.3 | OS AW | 170 ± 50 | −23.2‰ | 200 ± 50 | AD 1750 ± 50 |
145 | DG-OS | 25.4–34.3 | OS AW | 1050 ± 40 | −24.4‰ | 1060 ± 40 | AD 890 ± 40 |
Sample # | Sample Depth (m) | Material | Measured Radiocarbon Age (ybp) | 13C/12C Ratio | Conventional Radiocarbon Age (ybp) |
---|---|---|---|---|---|
BH-3 a | 3.4–3.5 | Wood | 220 ± 60 | -- | -- |
BH-3 b | 4.6 | Shell | 2890 ± 70 | +2.5‰ | 3340 ± 70 |
BH-4 a | 1.7–1.8 | OS | 480 ± 60 | -- | -- |
BH-4 b | 6.9–7.0 | OS | 4170 ± 100 | -- | -- |
BH-4 c | 14.3–14.9 | Wood | 7400 ± 140 | -- | -- |
BH-4 d | 15.2–15.3 | OS | 7100 ± 110 | -- | -- |
BH-4 e | 22.9–23.0 | OS | Insufficient carbon | -- | -- |
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Laton, W.R.; Foster, J.H. Abrupt Late Holocene Closure of San Elijo Lagoon, Northern San Diego County, California. Coasts 2023, 3, 227-239. https://doi.org/10.3390/coasts3030014
Laton WR, Foster JH. Abrupt Late Holocene Closure of San Elijo Lagoon, Northern San Diego County, California. Coasts. 2023; 3(3):227-239. https://doi.org/10.3390/coasts3030014
Chicago/Turabian StyleLaton, William R., and John H. Foster. 2023. "Abrupt Late Holocene Closure of San Elijo Lagoon, Northern San Diego County, California" Coasts 3, no. 3: 227-239. https://doi.org/10.3390/coasts3030014