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Conference Paper: Age for the oldest crown-group salamanders
Title | Age for the oldest crown-group salamanders |
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Authors | |
Issue Date | 2018 |
Citation | Goldschmidt 2018 Meeting, Boston, USA, 12-17 August 2018. In Goldschmidt Abstracts, 2018, p. 368 How to Cite? |
Abstract | Although abundant crown-salamanders have been reported from North America, Russia, Central and East Asia, the early diversification and evolutionary history of salamanders are unclear [1, 2]. Since the early 21st century, thousands of exceptionally well-preserved salamander specimens have been discovered from Jurassic-Cretaceous terrestrial formations in Inner Mongolia, Hebei Province and Liaoning Province, northeastern China [2, 3]. These Chinese fossils provide key information on the life histories and developmental patterns of early crown-group salamanders. Based on stratigraphic correlations, salamander-bearing strata in Daohugou and Reshuitang Villages are probably older than elsewhere. Previous age study indicate the Daohugou fossil bed is ~161.5 Ma [4] and the absolute age for the Reshuitang fossil bed is dubious. In this study, we collected one ash sample right above the
fossil bed in the Reshuitang outcrop. Our 40Ar/39Ar age of 161.6 ± 0.6 Ma for sanidines from this sample provides the first reliable age determination for Reshuitang salamanders. Our study indicates salamander-rich strata in Daohugou and Reshuitang were deposited contemporaneously and both
localities host the oldest crown-group salamanders. Furthermore, our high-precision age establishes a consistent chronostratigraphic model for correlating fossil-rich horizons in northeastern China and provides robust geochronological calibration for salamander evolution.
[1] Gao& Shubin (2001) Nature 410, 574-577. [2] Gao& Shubin (2003) Nature 422, 424-428. [3] Gao et al. (2013) Canadian Journal of Earth Sciences 50, 255-267. [4] He et al. (2004) Geophysical Research Letters 31, L20609. |
Description | Poster board 282 in Session 09a: Research frontiers in radioisotope geochronology and thermochronology |
Persistent Identifier | http://hdl.handle.net/10722/262135 |
DC Field | Value | Language |
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dc.contributor.author | Chang, S | - |
dc.contributor.author | Hemming, S | - |
dc.date.accessioned | 2018-09-28T04:53:55Z | - |
dc.date.available | 2018-09-28T04:53:55Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | Goldschmidt 2018 Meeting, Boston, USA, 12-17 August 2018. In Goldschmidt Abstracts, 2018, p. 368 | - |
dc.identifier.uri | http://hdl.handle.net/10722/262135 | - |
dc.description | Poster board 282 in Session 09a: Research frontiers in radioisotope geochronology and thermochronology | - |
dc.description.abstract | Although abundant crown-salamanders have been reported from North America, Russia, Central and East Asia, the early diversification and evolutionary history of salamanders are unclear [1, 2]. Since the early 21st century, thousands of exceptionally well-preserved salamander specimens have been discovered from Jurassic-Cretaceous terrestrial formations in Inner Mongolia, Hebei Province and Liaoning Province, northeastern China [2, 3]. These Chinese fossils provide key information on the life histories and developmental patterns of early crown-group salamanders. Based on stratigraphic correlations, salamander-bearing strata in Daohugou and Reshuitang Villages are probably older than elsewhere. Previous age study indicate the Daohugou fossil bed is ~161.5 Ma [4] and the absolute age for the Reshuitang fossil bed is dubious. In this study, we collected one ash sample right above the fossil bed in the Reshuitang outcrop. Our 40Ar/39Ar age of 161.6 ± 0.6 Ma for sanidines from this sample provides the first reliable age determination for Reshuitang salamanders. Our study indicates salamander-rich strata in Daohugou and Reshuitang were deposited contemporaneously and both localities host the oldest crown-group salamanders. Furthermore, our high-precision age establishes a consistent chronostratigraphic model for correlating fossil-rich horizons in northeastern China and provides robust geochronological calibration for salamander evolution. [1] Gao& Shubin (2001) Nature 410, 574-577. [2] Gao& Shubin (2003) Nature 422, 424-428. [3] Gao et al. (2013) Canadian Journal of Earth Sciences 50, 255-267. [4] He et al. (2004) Geophysical Research Letters 31, L20609. | - |
dc.language | eng | - |
dc.relation.ispartof | Goldschmidt 2018 Meeting | - |
dc.title | Age for the oldest crown-group salamanders | - |
dc.type | Conference_Paper | - |
dc.identifier.email | Chang, S: suchin@hku.hk | - |
dc.identifier.authority | Chang, S=rp01478 | - |
dc.identifier.hkuros | 292615 | - |
dc.identifier.spage | 368 | - |
dc.identifier.epage | 368 | - |