Editing Rochechouart impact structure (section)

== Age ==
The age of the Rochechouart impact is a matter of debate. The ages (within the error bars) spans from less than 150 million years ago to over 240 million years. Since late 1990s the spreading has reduced and the last four determinations (since 2010) are converging toward an age between 203 and 207 million years during the [[Rhaetian]], two to five million years older than the [[Triassic]]-[[Jurassic]] boundary.<ref>{{Cite book|title=(U-Th)/He, U/Pb, and Radiation Damage Dating of the Rochechouart-Chassenon Impact Structure, France-Master thesis|author1=Horne A |publisher=Arizona State University|year=2016}}</ref><ref name="Schmieder">{{cite journal|last=Schmieder|first=M.|author2=Buchner, E.|author3=Schwarz, W. H.|author4=Trieloff, M.|author5=Lambert, P.|date=2010-10-05|title=A Rhaetian <sup>40</sup>Ar/<sup>39</sup>Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record|journal=[[Meteoritics & Planetary Science]]|volume=45|issue=8|pages=1225–1242|bibcode=2010M&PS...45.1225S|doi=10.1111/j.1945-5100.2010.01070.x|s2cid=129154084 |doi-access=free}}</ref><ref name=":0">{{Cite journal |last1=Cohen |first1=Benjamin E. |last2=Mark |first2=Darren F. |last3=Lee |first3=Martin R. |last4=Simpson |first4=Sarah L. |date=2017-08-01 |title=A new high-precision 40Ar/39Ar age for the Rochechouart impact structure: At least 5 Ma older than the Triassic–Jurassic boundary |url=https://research-repository.st-andrews.ac.uk/bitstream/10023/10787/1/Mark_2017_MPS_RochechouartImpactStructure_CC.pdf |journal=Meteoritics & Planetary Science |language=en |volume=52 |issue=8 |pages=1600–1611 |bibcode=2017M&PS...52.1600C |doi=10.1111/maps.12880 |issn=1945-5100 |doi-access=free}}</ref><ref name="RSmith">{{cite journal|last=Smith|first=Roff|date=2011-11-16|title=Dark days of the Triassic: Lost world|journal=[[Nature (journal)|Nature]]|volume=479|issue=7373|pages=287–289|bibcode=2011Natur.479..287S|doi=10.1038/479287a|pmid=22094671|doi-access=free}}</ref><ref name=":6">{{Cite journal|last=Lambert|display-authors=etal|date=2017|title=CIRIR Programs: Drilling and Research Opportunities at the Rochechouart Impact Structure|journal=Lunar and Planetary Science Conference 48th|issue=1964|pages=# 1936|bibcode=2017LPI....48.1936L}}</ref>