Dating fossils through strata and radiometric samples
An outline of the geology of Australia, with palaeontological notes by Smith, E.
Chronological Analysis of the Scriptures- Literal interpretation of the scriptures led some people to conclude that the Earth was created approximately 6,000 years old.
Volcanoes are not entirely off the hook, according to this new scenario; they have simply been demoted to accessories to the crime.
The reason for the sudden, explosive growth of the microbes, new evidence shows, may have been their novel ability to use a rich source of organic carbon, aided by a sudden influx of a nutrient required for their growth: the element nickel, emitted by massive volcanism at just that time.
The new solution to this mystery is published this week in the Proceedings of the National Academy of Sciences by MIT professor of geophysics Daniel Rothman, postdoc Gregory Fournier, and five other researchers at MIT and in China.
The researchers’ case builds upon three independent sets of evidence.
This is because, in just 100,000,000 years of time, not enough parent will have decayed for daughter concentrations to be reliably measured.
Sedimentary rocks- Sedimentary rocks are generally not datable using isotopic methods because the grains in sedimentary rocks may come from many different rocks of different ages.
Evidence left at the crime scene is abundant and global: Fossil remains show that sometime around 252 million years ago, about 90 percent of all species on Earth were suddenly wiped out — by far the largest of this planet’s five known mass extinctions.
U nuclei undergo fission and the nucleus splits to form two smaller but very energetic nuclei that move away from each other.
When this happens in a mineral, the two departing nuclei leave behind a trail of destruction in the crystal lattice. Fission track dating is ideal for samples from recent times back to 100,000,000 years.
Isotopic age dating would not give the age of the sediment deposition or lithification, but rather the age of the source rocks.
Carbon-14 has a relatively short half life of 5,730 years. Beyond 60,000 - 80,000 years, there is too little Carbon-14 left in the sample and this technique cannot be used.