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Tree-Ring Dating of the Reshui-1 Tomb in Dulan County, Qinghai Province, North-West China.

Li M, Shao X, Yin ZY, Xu X - PLoS ONE (2015)

Bottom Line: Moreover, the ring-width variations of the samples are consistent with the existing chronologies from the region.The presence of late-wood of AD 715 in the samples indicated that the Reshui-1 Tomb was completed in late AD 715 or early 716, which means that the Reshui-1 Tomb was finished in the Tubo age.This date provides direct evidence for archaeologists to determine the owner's ethnicity and identify of the Reshui-1 Tomb.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.

ABSTRACT
Tuyuhun and Tubo were two important states that thrived in north-western China during AD 311-900 in parallel with the Han Chinese dynasties of Sui and Tang periods. The Reshui Tomb Cluster located in Dulan County of the north-eastern Tibetan Plateau is an important cultural relic of the Tuyuhun-Tubo age. The official excavations of the Reshui tombs were regarded as top events in archaeology in the 1980s and 1990s in China. The Reshui-1 Tomb is the largest one among the tombs in the area. Since its excavation, there have been debates on whether the owner of the tomb belonged to the Tuyuhun or Tubo ethnicity. Therefore, accurately dating the Reshui-1 Tomb has a critical place in studying the Tubo and Tuyuhun histories. We collected 7 discs and 11 increment cores of Qilian juniper (Juniperus przewalskii Kom.) from the exposed and fallen beams of the roof of the Reshui-1Tomb. The lengths of the 16 tree-ring records are between 69 and 152 years. Based on a previously developed master dating chronology using Qilian juniper samples from the eastern Qaidam Basin, the calendar dates of the 16 specimens were determined by the COFECHA program and visual dating procedure. The average inter-series correlation among the dated sample series is 0.696, indicating good quality of cross-dating. The year of the outermost rings is AD 715 for the 7 discs and 4 out of the 9 increment cores. Moreover, the ring-width variations of the samples are consistent with the existing chronologies from the region. The presence of late-wood of AD 715 in the samples indicated that the Reshui-1 Tomb was completed in late AD 715 or early 716, which means that the Reshui-1 Tomb was finished in the Tubo age. This date provides direct evidence for archaeologists to determine the owner's ethnicity and identify of the Reshui-1 Tomb.

No MeSH data available.


Correlation coefficients between the first 50-year segment of sample RS01 and QAC as the moving window shifted from -10 to +10 years of a potential target date with a one-year lag.Please refer to the text for details.
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pone.0133438.g005: Correlation coefficients between the first 50-year segment of sample RS01 and QAC as the moving window shifted from -10 to +10 years of a potential target date with a one-year lag.Please refer to the text for details.

Mentions: As described earlier, the essence of cross-dating for this study is the comparison between each individual sample series and the master dating chronology, Qaidam Archaeological Chronology (QAC). Fig 5 shows the changes in correlation coefficients between the first 50-year segment of sample RS01 and QAC (AD 605–654) as the moving window shifted from -10 to +10 years of a potential target date (year 0) with a one-year lag. Here, the correlations were calculated between RS01 and QAC successively for the 50-year window of the QAC dates from AD 595–644 (year -10) to AD 615–664 (year +10) It can be seen that as the sample series’ date matched with the master chronology at the target year (year 0 corresponding to QAC dates of AD 605–654), the correlation reached its peak value. Table 2 contains examples of COFECHA output of cross-dating for sample series RS01, RS03, and RS13. For RS01, AD 604 was the suggested calendar year prior to the first year of the sample series (Table 2). In other words, adding 604 to the years of the floating series RS01 would convert them to the calendar years, so that the first year of sample RS01 was AD 605. Ten out of the 16 sample series can be dated very easily in similar ways (RS01, 02, 05, 08, 09, 11, 14–17). For RS03, COFECHA indicated that 590 years should be added to the floating series for segments 3 and 4, so that the first calendar year of RS03 was AD 591, while adding 590 was suggested as choice #6 for the second segment (Table 2). For the first segment, however, COFECHA suggested adding 589 years to the sample years or the first sample year was assigned as AD 590 instead of 591. This was because a missing year should be added in AD 644, which would make the entire series match to the master chronology. A total of 5 samples series contained missing rings (RS03, 04, 06, 12, and 18). The sample series RS13 posed the greatest challenge in cross-dating for us. Most of the COFECHA’s top suggestions (Table 2) were far away from the timeframe indicated by previous studies (7th– 8th century) [4, 7, 8, 26]. According to these previous studies, we picked AD 591 as the calendar year prior to the first year of the sample series and the following visual dating process proved that it was the correct year, even though it appeared only twice in the top choices provided by COFECHA (Table 2).


Tree-Ring Dating of the Reshui-1 Tomb in Dulan County, Qinghai Province, North-West China.

Li M, Shao X, Yin ZY, Xu X - PLoS ONE (2015)

Correlation coefficients between the first 50-year segment of sample RS01 and QAC as the moving window shifted from -10 to +10 years of a potential target date with a one-year lag.Please refer to the text for details.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4526363&req=5

pone.0133438.g005: Correlation coefficients between the first 50-year segment of sample RS01 and QAC as the moving window shifted from -10 to +10 years of a potential target date with a one-year lag.Please refer to the text for details.
Mentions: As described earlier, the essence of cross-dating for this study is the comparison between each individual sample series and the master dating chronology, Qaidam Archaeological Chronology (QAC). Fig 5 shows the changes in correlation coefficients between the first 50-year segment of sample RS01 and QAC (AD 605–654) as the moving window shifted from -10 to +10 years of a potential target date (year 0) with a one-year lag. Here, the correlations were calculated between RS01 and QAC successively for the 50-year window of the QAC dates from AD 595–644 (year -10) to AD 615–664 (year +10) It can be seen that as the sample series’ date matched with the master chronology at the target year (year 0 corresponding to QAC dates of AD 605–654), the correlation reached its peak value. Table 2 contains examples of COFECHA output of cross-dating for sample series RS01, RS03, and RS13. For RS01, AD 604 was the suggested calendar year prior to the first year of the sample series (Table 2). In other words, adding 604 to the years of the floating series RS01 would convert them to the calendar years, so that the first year of sample RS01 was AD 605. Ten out of the 16 sample series can be dated very easily in similar ways (RS01, 02, 05, 08, 09, 11, 14–17). For RS03, COFECHA indicated that 590 years should be added to the floating series for segments 3 and 4, so that the first calendar year of RS03 was AD 591, while adding 590 was suggested as choice #6 for the second segment (Table 2). For the first segment, however, COFECHA suggested adding 589 years to the sample years or the first sample year was assigned as AD 590 instead of 591. This was because a missing year should be added in AD 644, which would make the entire series match to the master chronology. A total of 5 samples series contained missing rings (RS03, 04, 06, 12, and 18). The sample series RS13 posed the greatest challenge in cross-dating for us. Most of the COFECHA’s top suggestions (Table 2) were far away from the timeframe indicated by previous studies (7th– 8th century) [4, 7, 8, 26]. According to these previous studies, we picked AD 591 as the calendar year prior to the first year of the sample series and the following visual dating process proved that it was the correct year, even though it appeared only twice in the top choices provided by COFECHA (Table 2).

Bottom Line: Moreover, the ring-width variations of the samples are consistent with the existing chronologies from the region.The presence of late-wood of AD 715 in the samples indicated that the Reshui-1 Tomb was completed in late AD 715 or early 716, which means that the Reshui-1 Tomb was finished in the Tubo age.This date provides direct evidence for archaeologists to determine the owner's ethnicity and identify of the Reshui-1 Tomb.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.

ABSTRACT
Tuyuhun and Tubo were two important states that thrived in north-western China during AD 311-900 in parallel with the Han Chinese dynasties of Sui and Tang periods. The Reshui Tomb Cluster located in Dulan County of the north-eastern Tibetan Plateau is an important cultural relic of the Tuyuhun-Tubo age. The official excavations of the Reshui tombs were regarded as top events in archaeology in the 1980s and 1990s in China. The Reshui-1 Tomb is the largest one among the tombs in the area. Since its excavation, there have been debates on whether the owner of the tomb belonged to the Tuyuhun or Tubo ethnicity. Therefore, accurately dating the Reshui-1 Tomb has a critical place in studying the Tubo and Tuyuhun histories. We collected 7 discs and 11 increment cores of Qilian juniper (Juniperus przewalskii Kom.) from the exposed and fallen beams of the roof of the Reshui-1Tomb. The lengths of the 16 tree-ring records are between 69 and 152 years. Based on a previously developed master dating chronology using Qilian juniper samples from the eastern Qaidam Basin, the calendar dates of the 16 specimens were determined by the COFECHA program and visual dating procedure. The average inter-series correlation among the dated sample series is 0.696, indicating good quality of cross-dating. The year of the outermost rings is AD 715 for the 7 discs and 4 out of the 9 increment cores. Moreover, the ring-width variations of the samples are consistent with the existing chronologies from the region. The presence of late-wood of AD 715 in the samples indicated that the Reshui-1 Tomb was completed in late AD 715 or early 716, which means that the Reshui-1 Tomb was finished in the Tubo age. This date provides direct evidence for archaeologists to determine the owner's ethnicity and identify of the Reshui-1 Tomb.

No MeSH data available.