Nevertheless, ancient Archaean lead ores of galena have been used to date the formation of Earth as these represent the earliest formed lead-only minerals on the planet and record the earliest homogeneous lead-lead isotope systems on the planet.
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By the terms of the statute, it could be argued, it was not illegal to teach that apes descended from protozoa, to teach the mechanisms of variation and natural selection, or to teach the prevailing scientific theories of geology or the age of the Earth.
Gap creationism (also known as ruin-restoration creationism, restoration creationism, or "The Gap Theory") is a form of old Earth creationism that posits that the six-day creation, as described in the Book of Genesis, involved literal 24-hour days, but that there was a gap of time between two distinct creations in the first and the second verses of Genesis, explaining many scientific observations, including the age of the Earth.
In the 1974 historical novel Centennial, James Michener listed Sederholm among those scientists who made early estimates of the age of the Earth.
His work there led to the 1938 publication of measurements of the relative abundance of the isotopes of uranium, measurements that were used by Fritz Houtermans and Arthur Holmes in the 1940s to estimate the age of the Earth.