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F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
Second and last age of the Middle Ordovician epoch
467.3 ± 1.1 – 458.4 ± 0.9 Ma
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
–
−465 —
–
−460 —
–
−455 —
–
−450 —
–
−445 —
–
Subdivision of the Ordovician according to the ICS , as of 2021. [4] Vertical axis scale: millions of years ago.
Formal
Earth
Global (ICS )
ICS Time Scale
Age
Stage
Formal
Lower boundary definition
FAD of the Graptolite Undulograptus austrodentatus
Huangnitang Section, Huangnitang Village, Changshan , Zhejiang , China 28°51′14 ″N 118°29′23 ″E / 28.8539°N 118.4897°E / 28.8539; 118.4897
1997[5]
Upper boundary definition
FAD of the Graptolite Nemagraptus gracilis
Fågelsång section, Sularp Brook , Skåne , Sweden 55°42′49 ″N 13°19′32 ″E / 55.7137°N 13.3255°E / 55.7137; 13.3255
2002[6]
The Darriwilian is the upper stage of the Middle Ordovician . It is preceded by the Dapingian and succeeded by the Upper Ordovician Sandbian Stage. The lower boundary of the Darriwilian is defined as the first appearance of the graptolite species Undulograptus austrodentatus around 467.3 million years ago. It lasted for about 8.9 million years until the beginning of the Sandbian around 458.4 million years ago.[7] Andean-Saharan glaciation .[8]
The name Darriwilian is derived from Darriwil, a parish in County of Grant , Victoria (Australia) . The name was proposed in 1899 by Thomas Sergeant Hall .[9] [10]
Map of China showing the GSSP location.
The GSSP of the Darriwilian is the Huangnitang Section (28°51′14 ″N 118°29′23 ″E / 28.8539°N 118.4897°E / 28.8539; 118.4897 [11] Changshan County Town (Zhejiang , China ). It is an outcrop of the Ningkuo Formation, consisting of mainly black shale. The lower boundary of the Darriwilian is defined as the first appearance datum of the graptolite species Undulograptus austrodentatus in that section.[12]
A secondary fossil marker is the graptolite Arienigraptus zhejiangensis .[12]
Biostratigraphy [ edit ]
The base of the Darriwilian is also the base of the Undulograptus austrodentatus graptolite zone. This zone lies just above the North Atlantic Microzarkodina parva conodont zone. The base also lies in the upper part of the North American Histiodella altifrons conodont zone.[12]
The Undulograptus austrodentatus graptolite zone is known from outcrops around the world, making the base of the Darriwilian easily correlatable.[10]
Regional stages [ edit ]
The Darriwilian overlaps with the upper Arenig and the Llanvirn .[13] Arenig .[12]
References [ edit ]
^ Korochantseva, Ekaterina; Trieloff, Mario; Lorenz, Cyrill; Buykin, Alexey; Ivanova, Marina; Schwarz, Winfried; Hopp, Jens; Jessberger, Elmar (2007). "L-chondrite asteroid breakup tied to Ordovician meteorite shower by multiple isochron 40 Ar- 39 Ar dating". Meteoritics & Planetary Science . 42 1 ): 113–130. Bibcode :2007M&PS...42..113K . doi :10.1111/j.1945-5100.2007.tb00221.x .
^ Lindskog, A.; Costa, M. M.; Rasmussen, C.M.Ø.; Connelly, J. N.; Eriksson, M. E. (2017-01-24). "Refined Ordovician timescale reveals no link between asteroid breakup and biodiversification" . Nature Communications . 8 doi :10.1038/ncomms14066 . ISSN 2041-1723 . PMC 5286199 PMID 28117834 . It has been suggested that the Middle Ordovician meteorite bombardment played a crucial role in the Great Ordovician Biodiversification Event, but this study shows that the two phenomena were unrelated
^ "Chart/Time Scale" . www.stratigraphy.org . International Commission on Stratigraphy.
^ Mitchell, C.; Xu, Chen; Yuan-dong, Zhang; ZhI-hao, Wang; Webby, B.; Finney, S. (September 1997). "Definition of a global boundary stratotype for the Darriwilian Stage of the Ordovician System" . Episodes . 20 3 ): 158–166. doi :10.18814/epiiugs/1997/v20i3/003 . Retrieved 13 December 2020 .
^ Bergström, Stig; Finney, S.; Xu, Chen; Pålsson, Christian; Zhi-hao, Wang; Grahn, Yngve (June 2000). "A proposed global boundary stratotype for the base of the Upper Series of the Ordovician System: The Fågelsång section, Scania, southern Sweden" . Episodes . 23 2 ): 102–109. doi :10.18814/epiiugs/2000/v23i2/003 . Retrieved 13 December 2020 .
^ "GSSP Table - Paleozoic Era" . Geologic Timescale Foundation. Retrieved 30 November 2012 .
^ Pohl, Alexandre; Donnadieu, Yannick; Le Hir, Guillaume; Ladant, Jean-Baptiste; Dumas, Christophe; Alvarez-Solas, Jorge; Vandenbroucke, Thijs R. A. (28 May 2016). "Glacial onset predated Late Ordovician climate cooling" . Paleoceanography and Paleoclimatology . 31 6 ): 800–821. doi :10.1002/2016PA002928 hdl :1854/LU-8057556 S2CID 133243759 .
^ "Darriwilian" . Mindat.org . Archived from the original on 2020-11-06.
^ a b Mitchell, C. E.; Chen Xu; S. M. Bergström; Zhang Yuan-dong; Wang Zhi-hao; B. D. Webby; S. C. Finney (1997). "Definition of a global boundary stratotype for the Darriwilian Stage of the Ordovician System" . Episodes . 20 3 ): 158–166. doi :10.18814/epiiugs/1997/v20i3/003
^ David A. T. Harper; Tõnu Meidla; Thomas Servais (May 10, 2023). "A short history of the Ordovician System: from overlapping unit stratotypes to global stratotype sections and points" . Geological Society, London, Special Publications . 532 (1 ). The Geological Society of London : 13–30. Bibcode :2023GSLSP.532..285H . doi :10.1144/SP532-2022-285 . Archived from the original on 2024-05-18.
^ a b c d "GSSP for Darriwilian Stage" . Geologic Timescale Foundation. Retrieved 30 November 2012 .
^ Gradstein, F. M., ed. (2012). The Geologic Time Scale 2012 ISBN 978-0444594259 . Retrieved 30 November 2012 .
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R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Darriwilian&oldid=1231821181 " C a t e g o r i e s : ● D a r r i w i l i a n ● M i d d l e O r d o v i c i a n ● O r d o v i c i a n g e o c h r o n o l o g y H i d d e n c a t e g o r i e s : ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n m a t c h e s W i k i d a t a ● P a g e s u s i n g g a d g e t W i k i M i n i A t l a s
● T h i s p a g e w a s l a s t e d i t e d o n 3 0 J u n e 2 0 2 4 , a t 1 2 : 5 8 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
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