New Data on the Cenomanian–Turonian Boundary Oceanic Anoxic Event in the Biyuk-Karasu River Section (Central Crimea)
Journal: Moscow University Geology Bulletin
Year: 2019

Cenomanian–Turonian organic-rich clays deposited under periodic anoxic conditions in the basins of that time are recorded in carbonate sections. Cenomanian–Turonian boundary deposits were studied in the Biyuk-Karasu River section (Central Crimea). Dark organic-rich clays were found to intercalate with carbonate-poor clays in the formation during oceanic anoxic events. Mixed type II–III kerogens are abundant in these black beds which constitute oil source strata that are similar in their mineral