his document discusses the way radiometric dating and stratigraphic principles are used to establish the conventional geological time scale.
They quickly hardened to the dense, black rock called basalt Certain “parent” elements such as potassium, rubidium, uranium and samarium are radioactive and change by decay over time (very slowly according to today’s laboratory measurements) into “daughter” elements argon, strontium, lead and neodymium, respectively.
The example used here contrasts sharply with the way conventional scientific dating methods are characterized by some critics (for example, refer to discussion in "Common Creationist Criticisms of Mainstream Dating Methods" in the Age of the Earth FAQ and Isochron Dating FAQ).
A common form of criticism is to cite geologically complicated situations where the application of radiometric dating is very challenging.
Unlike people, you can’t really guess the age of a rock from looking at it.
Yet, you’ve heard the news: Earth is 4.6 billion years old. That corn cob found in an ancient Native American fire pit is 1,000 years old. Geologic age dating—assigning an age to materials—is an entire discipline of its own.