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Cette carte conceptuelle, cree avec IHMC CmapTools, contient des informations liees a : Geochronology, Martian Geologic Ages can be determined for Igneous & Metamorphic Rocks, Unstable Parent Elements include Uranium 235 & 238, AMAZONIAN Era is Last ~1.8 BYrs, Igneous & Metamorphic Rocks by Laboratory Analysis: Radiometric Dating, Unstable Parent Elements and Stable Daughter Products, Isotopes of Naturally- Occuring Radioactive Elements include Uranium 235 & 238, Laboratory Analysis: Radiometric Dating has been carried out for Moon, Uranium 235 & 238 decay to Lead 207 & 206, Unstable Parent Elements include Potassium 40, Laboratory Analysis: Radiometric Dating has been carried out for Meteorites, Laboratory Analysis: Radiometric Dating has been carried out for Earth, Stable Daughter Products include Lead 207 & 206, Counting Numbers of Impact Craters provides RELATIVE Measure of Age, Very Long Decay Half-Lives are 4.47 BYrs for 238U 703 MYrs for 235U 48.8 BYrs for 87Rb 1.25 BYrs for 40K, RELATIVE Measure of Age indicates One Terrain is Younger or Older than Another, ABSOLUTE Measure of Age is "Crystalization Age", ABSOLUTE Measure of Age is determined by abundance ratio between Unstable Parent Elements, Mars has 3 Major Epochs are named for Archetypal Regions on Mars, Very Long Decay Half-Lives are Constant, Martian Geologic Ages can be estimated for Terrains