Estimates of the amount and rate of sea-level change across the Rhaetian—Hettangian and Pliensbachian—Toarcian boundaries (latest Triassic to early Jurassic)

摘要: An attempt is made to determine the amount and rate of sea-level change for two major events in latest Triassic early Jurassic, both which are associated with mass extinctions, using best available facies evidence time scale. The marine deepening across Pliensbachian—Toarcian boundary, based on analysis excellent Yorkshire coast section, likely have been a few tens metres, at between 1cm 1.2 ka − 1 0.4 . Rhaetian—Hettangian (Triassic—Jurassic) boundary was different that rise immediately preceded by fall, effectively 9regression-transgression9 couplet. earliest Jurassic much more rapid than least cm 0.2 Whereas speed consistent growth oceanic ridges, appreciably Triassic—Jurassic suggestive tectonoeustatic mechanism involving stress-induced changes plate density.