Abstract
Calibrated amino acid racemisation methods allow paleobiologists to quantify the age distributions of fossil assemblages. Focussing on 110 Scissulina dispar and 110 Liloa sp. specimens collected from Bramble and Rib Reefs (central Great Barrier Reef, Australia), we create calibration curves for seven amino acids for each taxon. Using these curves we calculate seven quasi-independent age estimates for each specimen. We evaluate each calibration curve for consistency and use the weighted mean and uncertainty of the quasi-independent ages as the specimen age for geochronological analyses. We extend the ". Y" criterion for screening specimens and describing the precision of an AAR dataset from two amino acids to any number of amino acids. Using weighted mean ages and Y < 0.2 we demonstrate that the top 1.4 m of Bramble and Rib Reefs preserve remarkably well-mixed shell assemblages spanning from living to ∼3400 years old with median ages of 373 and 326 years old, respectively.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 73-86 |
| Number of pages | 14 |
| Journal | Quaternary Geochronology |
| Volume | 16 |
| DOIs | |
| State | Published - Apr 2013 |
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Keywords
- Amino acid geochronology
- Carbon-14
- Carbonate sediments
- Holocene
- Mollusca
- Time-averaging
ASJC Scopus subject areas
- Geology
- Earth and Planetary Sciences (miscellaneous)
- Stratigraphy
Cite this
Radiocarbon-calibrated multiple amino acid geochronology of Holocene molluscs from Bramble and Rib Reefs (Great Barrier Reef, Australia). / Kosnik, Matthew A.; Kaufman, Darrell S; Hua, Quan.
In: Quaternary Geochronology, Vol. 16, 04.2013, p. 73-86.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Radiocarbon-calibrated multiple amino acid geochronology of Holocene molluscs from Bramble and Rib Reefs (Great Barrier Reef, Australia)
AU - Kosnik, Matthew A.
AU - Kaufman, Darrell S
AU - Hua, Quan
PY - 2013/4
Y1 - 2013/4
N2 - Calibrated amino acid racemisation methods allow paleobiologists to quantify the age distributions of fossil assemblages. Focussing on 110 Scissulina dispar and 110 Liloa sp. specimens collected from Bramble and Rib Reefs (central Great Barrier Reef, Australia), we create calibration curves for seven amino acids for each taxon. Using these curves we calculate seven quasi-independent age estimates for each specimen. We evaluate each calibration curve for consistency and use the weighted mean and uncertainty of the quasi-independent ages as the specimen age for geochronological analyses. We extend the ". Y" criterion for screening specimens and describing the precision of an AAR dataset from two amino acids to any number of amino acids. Using weighted mean ages and Y < 0.2 we demonstrate that the top 1.4 m of Bramble and Rib Reefs preserve remarkably well-mixed shell assemblages spanning from living to ∼3400 years old with median ages of 373 and 326 years old, respectively.
AB - Calibrated amino acid racemisation methods allow paleobiologists to quantify the age distributions of fossil assemblages. Focussing on 110 Scissulina dispar and 110 Liloa sp. specimens collected from Bramble and Rib Reefs (central Great Barrier Reef, Australia), we create calibration curves for seven amino acids for each taxon. Using these curves we calculate seven quasi-independent age estimates for each specimen. We evaluate each calibration curve for consistency and use the weighted mean and uncertainty of the quasi-independent ages as the specimen age for geochronological analyses. We extend the ". Y" criterion for screening specimens and describing the precision of an AAR dataset from two amino acids to any number of amino acids. Using weighted mean ages and Y < 0.2 we demonstrate that the top 1.4 m of Bramble and Rib Reefs preserve remarkably well-mixed shell assemblages spanning from living to ∼3400 years old with median ages of 373 and 326 years old, respectively.
KW - Amino acid geochronology
KW - Carbon-14
KW - Carbonate sediments
KW - Holocene
KW - Mollusca
KW - Time-averaging
UR - http://www.scopus.com/inward/record.url?scp=84877151762&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84877151762&partnerID=8YFLogxK
U2 - 10.1016/j.quageo.2012.04.024
DO - 10.1016/j.quageo.2012.04.024
M3 - Article
VL - 16
SP - 73
EP - 86
JO - Quaternary Geochronology
JF - Quaternary Geochronology
SN - 1871-1014
ER -