Different age-scales are used to identify ages of several particular horizons. In general the ages recorded vary from age-scale to age-scale. A cumulative probabilistic procedure is given to illustrate how to use the differences in recorded behaviour in order to provide a most likely estimate of horizon ages based on the different age-scale data available. In this way the need to devise better measurement controls on particular horizons is brought more sharply into focus; as are those horizons which are sufficiently well-determined that they act as templates against which probabilistic assessments of more ill-controlled horizons can be gauged for resolution and precision.
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