Breistroffer Event
The Breistroffer Event (OAE1d) was an oceanic anoxic event (OAE) that occurred during the Middle Cretaceous period, specifically in the latest Albian, around 101 million years ago (Ma). == Causes == A rise in carbon dioxide and consequent negative carbon isotope excursion (CIE) ensued at the start of OAE1d, causing global temperatures to rise by 2 °C. During the Breistroffer Thermal Maximum, as this climatic interval has been referred to, Earth's mean surface air temperature was 23.3 °C. Average sea surface temperatures (SSTs) were 3 to 5 °C higher than today.