Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

Age

Geologic age in millions of years before present, 0 to 635 Ma.

Map an age in millions of years ago (ICS boundaries) to its Phanerozoic plus Ediacaran period, era and boundary ages; boundary ages belong to the younger period. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Period

Geologic period containing the age.

Era

Era containing the period.

Start

Base (older) boundary of the period in Ma.

End

Top (younger) boundary of the period in Ma.

• Geological models are scale-, site-, method-, and calibration-dependent. Heterogeneity, anisotropy, sampling, diagenesis, pressure-temperature history, instrument response, boundary conditions, and empirical-correlation range can dominate the result.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

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