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] This stage of the Ordovician was marked by the beginning of the Andean-Saharan glaciation.[8]
^Wellman, C.H.; Gray, J. (2000). "The microfossil record of early land plants". Phil. Trans. R. Soc. B. 355 (1398): 717–732. doi:10.1098/rstb.2000.0612. PMC 1692785. PMID 10905606.
^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: 14066. 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.
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...
Floian, all of the Dapingian and the early Darriwilian. The Llanvirn corresponds to the late Darriwilian. The Caradoc covers the Sandbian and the first...
volcanic rocks that were deposited 466 to 465 million years ago during the Darriwilian stage of the Middle Ordovician epoch. Rhyolite flows, breccias and hyaloclastics...
Tetragraptidae is an extinct family of graptolites from the Floian to Darriwilian epochs of the Ordovician Period. List of genera from Maletz (2014): †Corymbograptus...
extinct group of aquatic arthropods. Fossils have been registered from the Darriwilian age of the Middle Ordovician period, as early as 467.3 million years...
youngae, have been discovered in deposits of the Middle Ordovician period (Darriwilian epoch) in Iowa, in the United States. The name of the genus is derived...
(Emsian) Morocco Neoillaenus Gen. et comb. nov Valid Krylov Ordovician (Darriwilian–Katian) Estonia Russia Sweden The type species is "Illaenus" excellens...
substrat rocheux". dnr-mrn.gnb.ca. Retrieved 22 December 2019. "A mid-Darriwilian super volcano in northern New Brunswick, rapid climate change and the...
Shale (originally the Winneshiek Lagerstätte) is a Middle Ordovician (Darriwilian-age) geological formation in Iowa. The formation is restricted to the...
bicornis, but its age could be Llandeilo or Trentonian (earliest to latest Darriwilian, 450 to 465 million years ago). "Austin Glen Formation". USGS. Bock,...
in Lake Superior, and Ames crater in Oklahoma. The Middle Ordovician (Darriwilian) Winneshiek Lagerstätte sediments that filled in the crater contained...
Ordovician series. It is preceded by the Floian and succeeded by the Darriwilian. The top of the Floian is defined as the first appearance of the conodont...
"Fauna and ecology of the holothurian bed, Llandrindod, Wales, UK (Darriwilian, Middle Ordovician), and the oldest articulated holothurian". Palaeontologia...
formation in Shropshire, England. It preserves fossils dating back to the Darriwilian stage of the Ordovician period. Earth sciences portal England portal...
been observed from the Valongo Formation (Middle Ordovician: Dapingian-Darriwilian) of northern Portugal and have been reported, if not described, from...
form the order Eurypterida. The earliest known eurypterids date to the Darriwilian stage of the Ordovician period 467.3 million years ago. The group is...
Retallack described the new species Prototaxites honeggeri from the Darriwilian stage of the Middle Ordovician Douglas Lake Member of the Lenoir Limestone...
(Echinodermata) in the Ordovician (Volkhov Regional Stage, Dapingian and Darriwilian) of Baltica and Special Aspects of Stylophoran Axial Symmetry". Paleontological...
(2015), "The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa", BMC Evolutionary...
Sandbian is the first stage of the Upper Ordovician. It follows the Darriwilian and is succeeded by the Katian. Its lower boundary is defined as the...
Douglasocaris is a genus of bivalved arthropod from the Middle Ordovician (Darriwilian, 460 million years old) Douglas Lake Member of the Lenoir Limestone from...
Gnathostomata (/ˌnæθoʊˈstɒmətə/; from Ancient Greek: γνάθος (gnathos) 'jaw' + στόμα (stoma) 'mouth') are the jawed vertebrates. Gnathostome diversity comprises...
Rhynie, Scotland. Palaeoglomus strotheri from the Middle Ordovician (Darriwilian, 460 million years old) Douglas Lake Member of the Lenoir Limestone from...
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