Geological Time (Popularity: ): Lecture notes on different methods of measuring geologic time. Geologic Time (Popularity: ): USGS on-line publication about the relative and radiometric geologic time scales, age of the earth, ... Berkeley Geochronology Center (Popularity: ): Non-profit scientific research institution dedicated to establishing the history of the Earth, its various inhabitants, ... Web Time Machine (Popularity: ): Geologic time scale with links for each time interval. Geochronology Working Group at Vienna University (Popularity: ): Uses radiometric dating and classical geochronological methods to constrain the timing of geological processes, primarily ... Synoptic Time Table of Earth History (Popularity: ): Chart correlates geologic, paleontologic, and absolute time scales, also including glaciations. Strontium Isotope Stratigraphy (Popularity: ): Describes this method, used primarily to date marine sediments, and provides access to the global ... Douglas Henderson's Earth History Illustrations (Popularity: ): The works of artist Douglas Henderson, an illustrator of scientific reconstructions of earth history Radiometric Time Scale (Popularity: ): Discusses the uses of limitations of different radiometric dating techniques. A Radiometric Dating Resource List (Popularity: ): Large annotated directory of internet resources on radiocarbon and other radioactive dating methods, including creationists' ...