For example , the boundary between the MISC@1 period and the Paleogene period is defined by the Cretaceous -- Tertiary extinction event , which marked the demise of the dinosaurs and of many marine species .

For example , the boundary between the MISC@1 period and the Paleogene period is defined by the extinction event , known as the Cretaceous -- Tertiary extinction event , that marked the demise of the dinosaurs and of many marine species .
