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Orbital tuning dating

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The resultant chronology is also insensitive to the specific indicator used.

The error associated with each tuning approach is estimated independently and propagated through to the average result.

If such an “index fossil” is found in a different rock of unknown age, secular scientists tend to assume that particular rock to also be between 200 and 180 million years old.

In other words, the fossils found in rocks are used to date other rocks.

But closer inspection reveals that these methods are not truly independent, and the agreement between them is the result of circular reasoning.

Dating Rocks and Fossils: Circular Reasoning Because secular scientists believe Earth’s sedimentary rocks were deposited over millions of years, they assume a given rock layer represents a “snapshot” of the history of life at a certain time in the “prehistoric” past.

An overall Matuyama-Brunhes reversal age of 783.4 ± 0.6 ka is calculated, which allowing for inherent uncertainties in the astronomical dating approach, is indistinguishable from the LR04 stack age (780 ± 5 ka) for the geomagnetic boundary.

The core also preserves the location of the Australasian tektites, and the Matuyama-Brunhes boundary with Bayesian age-depth models used to determine the ages of these events, c. Linear age-depth extrapolation, allowing for uncertainties associated with potential hiatuses in five different terrestrial sections, defines a geomagnetic reversal age of 789 ± 6 ka.

This U-Pb zircon age, coupled with a newly obtained oxygen isotope chronology, yields an MBB age of 770.2 ± 7.3 ka.

Our MBB age is consistent with those based on the latest orbitally tuned marine sediment records and on an Antarctic ice core.

Thus the final chronology has an average error of /-5000 yr.

The youngest geomagnetic polarity reversal, the Matuyama-Brunhes boundary (MBB), provides an important datum plane for sediments, ice cores, and lavas.