Editing Triassic (section)

=== Paleooceanography ===
[[Eustatic sea level]] in the Triassic was consistently low compared to the other geological periods. The beginning of the Triassic was around present sea level, rising to about {{convert|10|–|20|m|0}} above present-day sea level during the Early and Middle Triassic. Sea level rise accelerated in the Ladinian, culminating with a sea level up to {{convert|50|m|0}} above present-day levels during the Carnian. Sea level began to decline in the Norian, reaching a low of {{convert|50|m|0}} below present sea level during the mid-Rhaetian. Low global sea levels persisted into the earliest Jurassic. The long-term sea level trend is superimposed by 22 sea level drop events widespread in the geologic record, mostly of minor (less than {{convert|25|m|0|adj=on}}) and medium ({{convert|25|–|75|m|0|adj=on}}) magnitudes. A lack of evidence for Triassic continental ice sheets suggest that glacial eustasy is unlikely to be the cause of these changes.<ref name="Eustatic">{{Cite conference|last=Haq |first=Bilal U. |author-link=Bilal U. Haq |date=December 2018 |title=Triassic eustatic variations reexamined |journal=GSA Today |publisher=[[Geological Society of America]] |volume=28 |issue=12 |pages=4–9 |doi=10.1130/GSATG381A.1 |bibcode=2018GSAT...28l...4H |s2cid=134477691 |url=https://www.geosociety.org/gsatoday/science/G381A/article.htm|doi-access=free }}</ref> It has generally been assumed that the cause was changes in volume of the global ocean basin due to variations in oceanic volcanism, with largest volumes occurring in volcanism's absence when the ocean basins were subsiding.<ref>{{cite conference|editor-first1=Cheryl K.|editor-last1=Wilgus|editor-first2=Bruce S.|editor-last2=Hastings|editor-first3=Henry|editor-last3=Posamentier|editor-first4=John|editor-last4=van Wagoner|editor-first5=Charles A.|editor-last5=Ross|editor-first6=Christopher G. St. C.|editor-last6=Kendall |last=Embry |first=Ashton F. |chapter=Triassic Sea-Level Changes: Evidence from the Canadian Arctic Archipelago |title=Sea-Level Changes: An Integrated Approach|pages=249-259|publisher=Geological Survey of Canada|year=1985|location=[[Calgary]], [[Alberta]]}}</ref> Variation in water and sediment delivery to the oceans, with higher sea levels during pluvial eras lasting up to four million years, is also hypothesised to be behind these sea level variations.<ref name="Eustatic"/>