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To date past events, processes, formations, and fossil organisms, geologists employ a variety of techniques.

These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events.

Some method of correlating rock units must be found.

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Jeffery Amherst uses his first name and surname in his email address: [email protected] However, most people write email addresses without capital letters ([email protected]).The need to correlate over the rest of geologic time, to correlate nonfossiliferous units, and to calibrate the fossil time scale has led to the development of a specialized field that makes use of natural radioactive isotopes in order to calculate absolute isotopes has been improved to the point that for rocks 3 billion years old geologically meaningful errors of less than ±1 million years can be obtained.The same margin of error applies for younger fossiliferous rocks, making absolute dating comparable in precision to that attained using fossils.Our vision is a healthy, equitable, and environmentally sustainable California where all people thrive and health equity principles are the foundation of government policies and practices.The Health Equity Policy & Planning Unit's mission is to provide statewide leadership in policy, systems, and environmental change by improving health, equity, and environmental sustainability in California government decision-making, practices, and policies.