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Geology is, in essence, a historical science in which timing is of the utmost importance.Geochronology underpins the study of Earth history and puts fundamental constraints on the rate of biological evolution (Chen and Benton, 2012; Gradstein et al., 2012).

It renders on any modern HTML-5 compatible web browser, including those installed on smartphones and tablet computers.

Third, by using the online version, the user is guaranteed to have accessed the most up-to-date version of the software.

For synchronously acquired isotopic data, such as Ar-data measured by noble gas mass spectrometry or U-Pb data measured by laser ablation inductively coupled mass spectrometry (LAICPMS), this is achieved using redundant ratios.

For example, in the case of ]) are based on the same number of data points.

For many years, a is a user-friendly toolbox that allows geologists to calculate and visualise geochronological data within a familiar spreadsheet environment (Ludwig, 1988, 1999, 2003a, 2012).

Few computer programs have been as widely used in the Earth Sciences as .

It introduces a profile log-likelihood method for the calculation of asymmetric confidence intervals.

Section 8 discusses three further methods to visualise multi-aliquot collections of ages.

Unfortunately this is not always the case for the covariance terms.

The remaining two classes of input formats specify the covariance structure of the data without requiring any actual covariances or correlation coefficients.

In all other cases, the error propagation uses a first order Taylor approximation: ].

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