Editing Triassic (section)

==== Coal ====
[[File:Prospect Hill Monterey Pine Forest.jpg|thumb|upright=1.2|Immediately above the Permian–Triassic boundary the [[glossopteris]] flora was suddenly<ref>{{cite journal |last1=Hosher |first1=WT Magaritz M Clark D |year=1987 |title=Events near the time of the Permian-Triassic boundary |journal=Mod. Geol. |volume=11 |pages=155–80 [173–74]}}</ref> largely displaced by an [[Australia]]-wide coniferous flora.]]

No known [[coal]] deposits date from the start of the Triassic Period. This is known as the [[Early Triassic]] "coal gap" and can be seen as part of the [[Permian–Triassic extinction event]].<ref name="Retallack1996a">{{cite journal |last1=Retallack |first1=G. J. |last2=Veevers |first2=J. J. |last3=Morante |first3=R. |year=1996 |title=Global coal gap between Permian-Triassic extinction and Middle Triassic recovery of peat-forming plants |journal=Bulletin of the Geological Society of America |volume=108 |issue=2 |pages=195–207 |doi=10.1130/0016-7606(1996)108<0195:GCGBPT>2.3.CO;2 |bibcode=1996GSAB..108..195R}}</ref> Possible explanations for the coal gap include sharp drops in sea level at the time of the Permo-Triassic boundary;<ref>{{cite journal |last1=Holser |first1=WT |last2=Schoenlaub |first2=H-P |last3=Klein |first3=P |last4=Attrep |first4=M |last5=Boeckelmann |first5=Klaus |display-authors=etal |year=1989 |title=A unique geochemical record at the Permian/Triassic boundary |url=https://www.nature.com/articles/337039a0 |journal=[[Nature (journal)|Nature]] |volume=337 |issue=6202 |pages=39 [42] |bibcode=1989Natur.337...39H |doi=10.1038/337039a0 |s2cid=8035040 |access-date=24 November 2023|url-access=subscription }}</ref> acid rain from the Siberian Traps eruptions or from an impact event that overwhelmed acidic swamps; climate shift to a greenhouse climate that was too hot and dry for peat accumulation; evolution of fungi or herbivores that were more destructive of wetlands; the extinction of all plants adapted to peat swamps, with a hiatus of several million years before new plant species evolved that were adapted to peat swamps;<ref name="Retallack1996a"/> or soil anoxia as oxygen levels plummeted.<ref>{{cite journal |last1=Retallack |first1=G.J. |last2=Krull |first2=E.S. |year=2006 |title=Carbon isotopic evidence for terminal-Permian methane outbursts and their role in extinctions of animals, plants, coral reefs, and peat swamps |journal=Geological Society of America Special Paper |volume=399 |page=249 |url=https://cpb-us-e1.wpmucdn.com/blogs.uoregon.edu/dist/d/3735/files/2013/07/ragnarok-15t4q8w.pdf |access-date=14 December 2020 |doi=10.1130/2006.2399(12) |isbn=978-0-8137-2399-0}}</ref>