A geologic time scale with linked images of paintings of different geologic time intervals by Douglas Henderson. (
http://gallery.in-tch.com/~earthhistory/geologic%20timepage.html
)
Authoritative compendium of information on radiocarbon methods from the editors of Radiocarbon, the foremost academic journal on the subject. (
http://www.radiocarbon.org/Info/index.html
)
A good illustration of the concept of "concordance" of radiometric dates from Dr. Joe Meert of Indiana State University, Terre Haute, Indiana, USA. (
http://baby.indstate.edu/gga/pmag/radiomet.htm
)
An interactive calculator that resets the history of Earth to a number of metaphors - find out how many days humans have existed on the cosmic calendar year. A revealing insight into the enormity of deep time. (
http://www.athro.com/geo/hgfr1.html
)
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