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For older sediments, techniques include tephrochronology (involving potassium) and magnetostratigraphy (involving iron).
NYT > Home Page By C. CLAIBORNE RAY 2011
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In tephrochronology, layers of volcanic ash, tephra, often contain potassium-bearing minerals whose crystallization age can be determined, even going back billions of years.
NYT > Home Page By C. CLAIBORNE RAY 2011
colleen commented on the word tephrochronology
The dating of volcanic eruptions and other events by studying layers of tephra. (OED)
March 11, 2007