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Theoretically, Creationism remains workable within a wide range of age estimates.
Scientists have proposed numerous age estimation methods.
Wiens has a Ph D in Physics, with a minor in Geology.
His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.
We already went over the stuff that would be in the meteoroid category, we'll go to the next one - meteors. This is actually a picture from the 1998 Leonid meteor shower, which makes sense, because that's where it appears the meteors are coming from. It surprises many people that are not due to asteroids but are instead caused by comets.
Some of the constellations are labeled in this view, which shows many stars (smallish streaks) which all appear to be moving in a uniform direction, while the meteors (longer streaks) appear to be radiating from the constellation of Leo (if you were to trace their motion back).
Since 1955 the estimate for the age of the Earth has been based on the assumption that certain meteorite lead isotope ratios are equivalent to the primordial lead isotope ratios on Earth.
In 1972 this assumption was shown to be highly questionable.
For teaching and sharing purposes, readers are advised to supplement these historic articles with more up-to-date ones suggested in the Related Articles and Further Reading below.
And it does not work on rocks or thoroughly mineralized fossils; it is only useful for relatively well-preserved organic materials such as cloth, wood, and other non-fossilized materials.
Other methods must be used to estimate the age of rocks and minerals.
He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.
He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.