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In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.
These methods — some of which are still used today — provide only an approximate spot within a previously established sequence: Think of it as ordering rather than dating.
Biostratigraphy: One of the first and most basic scientific dating methods is also one of the easiest to understand.
Here is one example of an isochron, based on measurements of basaltic meteorites (in this case the resulting date is 4.4 billion years) [Basaltic1981, pg. Skeptics of old-earth geology make great hay of these examples.The Wheeler Formation has been previously dated to approximately 507 million year old, so we know the trilobite is also about 507 million years old.But, how can we determine how old a rock formation is, if it hasn’t previously been dated?The rate of decay (or half-life) of C14 was proven linear, allowing scientists to determine the approximate date of the expiration of a life form based on the amount of C14 remaining in the fossil.This dating can be used on once-living items and can provide information on related spaces.