The Obsidian Clock
http://www.ornl.gov/info/reporter/no7/clock.htmA press release from the Oak Ridge National Laboratory reporting that by using secondary ionization mass spectrometry, experimental calibration, and sophisticated modeling methods; is developing a technique to accurately determine when an obsidian tool was crafted.
Submitted in section: Archaeology: Methodology: Dating: Obsidian Hydration: The Obsidian Clock