Editing Ordovician (section)

===Ordovician meteor event===
The [[Ordovician meteor event]] is a proposed shower of meteors that occurred during the Middle Ordovician Epoch, about 467.5 ± 0.28 million years ago, due to the break-up of the [[L chondrite]] parent body.<ref name=Lindskog>{{Cite journal|last1=Lindskog|first1=A. |last2=Costa|first2=M. M. |last3=Rasmussen|first3=C.M.Ø. |last4=Connelly|first4=J. N. |last5=Eriksson|first5=M. E. |date=2017-01-24|title=Refined Ordovician timescale reveals no link between asteroid breakup and biodiversification|journal=Nature Communications|language=En|volume=8|pages=14066 |doi=10.1038/ncomms14066| pmid=28117834|pmc=5286199 |bibcode=2017NatCo...814066L |issn=2041-1723 }}</ref> It is not associated with any major extinction event.<ref name=Nature1>{{cite journal |bibcode=2004Natur.430..323H |title=Fast delivery of meteorites to Earth after a major asteroid collision |last1=Heck |first1=Philipp R. |last2=Schmitz |first2=Birger |last3=Baur |first3=Heinrich |last4=Halliday |first4=Alex N. | author-link4 = Alex N. Halliday |last5=Wieler |first5=Rainer |volume=430 |year=2004 |pages=323–5 |journal=[[Nature (journal)|Nature]] |doi=10.1038/nature02736 |pmid=15254530 |issue=6997|s2cid=4393398 }}</ref><ref>{{cite journal |bibcode=1996Icar..119..182H |title=Meteoritic, Asteroidal, and Theoretical Constraints on the 500 MA Disruption of the L Chondrite Parent Body |last1=Haack |first1=Henning |last2=Farinella |first2=Paolo |last3=Scott |first3=Edward R. D. |last4=Keil |first4=Klaus |volume=119 |issue=1 |year=1996 |pages=182–91 |journal=Icarus |doi=10.1006/icar.1996.0010}}</ref><ref>{{cite journal |bibcode=2007M&PS...42..113K |title=L-chondrite asteroid breakup tied to Ordovician meteorite shower by multiple isochron 40Ar-39Ar dating |last1=Korochantseva |first1=Ekaterina V. |last2=Trieloff |first2=Mario |last3=Lorenz |first3=Cyrill A. |last4=Buykin |first4=Alexey I. |last5=Ivanova |first5=Marina A. |last6=Schwarz |first6=Winfried H. |last7=Hopp |first7=Jens |last8=Jessberger |first8=Elmar K. |volume=42 |issue=1 |year=2007 |pages=113–30 |journal=[[Meteoritics & Planetary Science]] |doi=10.1111/j.1945-5100.2007.tb00221.x|s2cid=54513002 |doi-access=free }}</ref> A 2024 study found that craters from this event cluster in a distinct band around the Earth, and that the breakup of the parent body may have formed a [[ring system]] for a period of about 40 million years, with frequent falling debris causing these craters.<ref name=":0" />