How the Atlantic Ocean caused the fourth mass extinction🌊 The Triassic period was ended by volcanic eruptions and the splitting of the supercontinent PangeaThis released up to 100,000 gigatons of carbon dioxide into the air, increasing global temperatures and acidifying the oceans. This split was the birth of the Atlantic Ocean. And this marked the end of the Triassic Period, which was a short period of geologic history between two mass extinctionsThe Triassic was known as a period of rapid spe