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The Cretaceous – Tertiary Boundary (K-T) Extinction Essay Preview: The Cretaceous – Tertiary Boundary (K-T) Extinction Report this essay ABSTRACT Several mass extinctions have occurred during the Earths history. The Cretaceous – Tertiary Boundary (K-T) Extinction caused the loss of at least three-quarters of all species known at that time including the dinosaurs. The cause.