Generic/subgeneric level data on bivalves from the Jurassic Proto-Atlantic record three regional extinction events

at the end of the Pliensbachian

beginning of the Callovian and Tithonian stages .The extinction at the Tithonian is the most important in terms of magnitude and duration .These extinctions can correlate with sea-level changes and associated environmental deterioration.The end-Pliensbachian extinction

related to anoxia caused by a sharp rise of sea level

selectively eliminated infaunal bivalves .In the Callovian event

which was linked to a regional regression

the selection against infaunal group occurred only in mid-latitude area.Tithonian event was a result of extreme and prolonged regression and lacked the selective extinction of infaunal bivalves .