How do we put dates to the past? Learn about how we estimated the Earth's age and the scientists who played a role, including Archbishop Ussher, Lord Kelvin, Arthur Holmes, and Willard Libby. This program will cover relative dating methods, absolute dating techniques, dendrochronology, radioactive absolute dating, carbon-14, and the Laetoli site and its significance. We'll also explore the four main eras of human history: Precambrian, Paleozoic, Mesozoic, and Cenozoic.

Originally released by Cerebellum Corporation, 2013. Streaming video file encoded with permission for digital streaming by Infobase on July 10, 2018.

Putting Dates to the Past (1:28); --History (3:55); -- Relative Dating Methods (1:51); -- Absolute Dating Techniques (1:29); -- Radioactive Absolute Dating: Carbon-14 (4:04); -- Delicacy of a Footprint (3:14); -- Summary (3:15); -- Credits: Putting Dates to the Past (2:15); .