94 million years ago, the Cenomanian stage of the Cretaceous period was coming to an end, just as enormous volcanoes in the Caribbean were erupting, covering the ocean floor in enough lava to cover the Mediterranean Sea. The CO2 from these eruptions caused a warming event and acid rain, accelerating the phosphorus cycle and breaking down silicates in rocks, which led to an increased flow of nutrients from rivers into the Cretaceous seas. The warm waters and increased nutrients led to an explosio

The Cretaceous Period: Major Events, Animals, and When It Lasted