Dapingium

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system series step ≈ age ( mya )
higher higher higher younger
Ordovician Upper Ordovician Brain antium 443.4
⬍
445.2
Katium 445.2
⬍
453
Sandbium 453
⬍
458.4
Middle Ordovician Darriwilium 458.4
⬍
467.3
Dapingium 467.3
⬍
470
Lower Ordovician Floium 470
⬍
477.7
Tremadocium 477.7
⬍
485.4
deeper deeper deeper older

The Dapingium is the older of the two chronostratigraphic stages of the Middle Ordovician series of the Ordovician in geological history . The Dapingium stage corresponds in absolute dating to the period from about 470 to 467.3 million years. The Dapingium follows the Floium and is replaced by the Darriwilium .

Naming and history

The stage is named after a small village near the GSSP. The GSSP was proposed by an international group of scientists in 2005 and confirmed by the ICS in 2007 . The name for the stage was published in 2009. The Dapingium corresponds to the middle and higher part of the earlier Arenigium series (or level).

Definition and GSSP

The upper limit of the level is the first appearance of the graptolite species Undulograptus austrodentatus . The lower limit (and thus also the upper limit of the previous level of the floium ) is defined by the first appearance of the conodont species Baltoniodus triangularis . The official reference profile (GSSP = "Global Stratotype Section and Point") for the Dapingium is the Huanghuachang profile in the Chinese province of Hubei , 22 km northeast of Yichang on the road from Yichang towards Xinshan County .

literature

  • Felix Gradstein, Jim Ogg and Alan Smith: A Geologic timescale. Cambridge University Press 2004 ISBN 978-0-521-78673-7 .
  • EE Mitchell, Xu Chen, Stig. M. Bergstroem, Yuan-dong Zhang, Zhi-hao Wang, BD Webby and SC Finney: Definition of a global stratotype for the Darriwilian Stage of the Ordovician System. Episodes, 20 (3): 158-166, Beijing 1997 ISSN  0705-3797 PDF .
  • Xiaofeng Wang, Svend Stouge , Bernd-D. Erdtmann, Xiaohong Chen, Zhihong Li, Chuanshang Wang, Qingluan Zeng, Zhiqiang Zhou and Huiming Chen: A proposed GSSP for the base of the Middle Ordovician Series: the Huanghuachang section, Yichang, China. Episodes, 28 (2): 105-116, Beijing 2005 PDF ISSN  0705-3797
  • Xiaofeng Wang, Svend Stouge , Xiaohong Chen, Zhihong Li, Chuanshang Wang 2009: Dapingian Stage: standard name for the lowermost global stage of the Middle Ordovician Series. Lethaia, 42 (3): 377-380 doi: 10.1111 / j.1502-3931.2009.00169.x

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