Volcanos
http://www.volcano.si.edu/gvp/
carbon dating
http://www.pbs.org/wgbh/nova/first/radiocarbon.html
ice core
http://www.pbs.org/wgbh/nova/warnings/stories/
Tree Rings
http://www.valdosta.peachnet.edu/~grissino/

Catastrophe: A Quest for the Origins of the Modern World David Keys

Secrets of the Dead Video Series for Home Use

Catastrophe! Part I
Catastrophe! Part II