Complete data dictionary for the National Geochronological Database

Tables and fields explained here are available only as part of the comprehensive download package geochron-csv.zip or in the full geodatabase geochron-gdb.zip

Table	Description
main	Sample locations and characteristics
FT	Fission track dating results, observations, and parameters
K_Ar	Potassium-Argon and Argon-Argon radiometric age results, observations, and parameters
Rb_Sr	Rubidium-Strontium radiometric dating results, observations, and parameters
Sm_Nd	Samarium-Neodymium radiometric dating results, observations, and parameters
U_Th_Pb	Radiometric age estimates, observations, and parameters using techniques involving isotopes of uranium, thorium, and lead.
datadxny	Data dictionary, explaining tables and fields