5 links
Berkeley Geochronology Center
bgc.org
Non-profit scientific research institution dedicated to establishing the history of the Earth, its various inhabitants, and its interactions with the rest of our Solar System, th…
Geochronology Working Group at Vienna University
univie.ac.at
Uses radiometric dating and classical geochronological methods to constrain the timing of geological processes, primarily in the Eastern Alps, the Carpathian - Pannonian region and…
Geologic Time
pubs.usgs.gov
USGS on-line publication about the relative and radiometric geologic time scales, age of the earth, index fossils, and related topics.
Geological Time
rainbow.ldeo.columbia.edu
Lecture notes on different methods of measuring geologic time.