Before radiocarbon dating
They concluded that the helium in the rock was 100,000 times more plentiful than it should have been if the rocks were really 1.5 billion years old.
They concluded that their findings are consistent with an Earth that is about 6,000 years old.
Acknowledgments: The editor wishes to acknowledge many useful comments and contributed material from numerous friends and colleagues, including Glenn Branch, Brent Dalrymple, Peter Hess, Mark Isaak, Duane Jeffery, Kenneth Miller, Steven Peck, Eugenie Scott and others.
The relatively short-lived C taken into organic matter is also slightly variable. However, under about 20,000 years the results can be compared with dendrochronology, based on tree rings.However, before accepting any radiocarbon date, one should know how the technique works, its limitations, and its assumptions.