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Elements in this series progressively fill the 5f electron orbitals and thus have similar electron configurations.

Since the chemical properties of an element depend upon its electron structure, members of the actinide series have similar chemical properties.

Chemical abrasion (CA) is a routine step prior to thermal ionization mass spectrometry (TIMS) dating of zircon to remove radiation-damaged parts of grains that may have experienced open system behavior and loss of radiogenic Pb.

While this technique has been shown to improve the accuracy and precision of TIMS dating, its application to high-spatial resolution dating methods, such as secondary ion mass spectrometry (SIMS), is relatively uncommon.

Zircon from the Bishop Tuff (eastern California) was dated by the U-Pb isotope dilution thermal ionization mass spectrometry (ID-TIMS) method to evaluate time scales of magmatic evolution and applicability of the method to rocks younger than 1 Ma.

The Ar sanidine age, requiring that most zircon crystallized immediately before eruption. older indicate minimum times that a small portion of the grains resided in the magma.

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Throughout the world, there is a sudden extinction of a large number of taxa, including the dinosaurs, at the geological boundary known as the K-T (Cretaceous – Tertiary) boundary.

On the contrary, other than Gentry, the principle sources that he references will be seen to provide compelling evidence for the date of a major bolide event at Chicxulub at 65 million years, coinciding with the date of a major extinction, which occurred geologically at the K-T (Cretaceous – Tertiary) boundary and which included the extinction of dinosaurs.

Harris’s paper is rather disjointed and I can see no better way to address its fallacies than by categorising my comments into those about the quality of the essay and the errors of fact and reasoning it contains.

This article will address the uranium-lead (U-Pb) and thorium-lead (Th-Pb) models.

Along with stratigraphic assumptions, the U-Pb and Th-Pb dating methods have been regarded as the gold standard for “deep-time” dating.

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