A search for the oldest lunar rock is still ongoing but the identification of the most ancient sample has remained elusive see Table 5 in the section of Plutonic Rocks. New York Times. Lunar Sample Science Today. In other projects Wikimedia Commons. I think this covers the bases fairly neatly. A major cause of the escape of gas from lunar rock is probably the impact event which ejected the rock from its place of origin to its place of discovery. Consequently, if we alight upon a sample in which the molar ratios of Th and Pb are 0.
Nine of the papers presented at the conference deal with the age of the moon.
Moons of our Solar System
Science is interesting. Because of their rarity on Earth, and the difficulty of obtaining more, Moon rocks have been frequent targets of theft and vandalismand many have gone missing or were stolen. Were these tests for certain geological events or impurities that the creationist website is misrepresenting? The number after each element is its atomic weight, equal to the number of protons plus neutrons in its nucleus. Now, I know from experience not to trust creationists very much