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It was whilst writing their book and researching Offas Dyke that they came across the writings of a 6th century Roman called Procopius.
This latter day Roman mentions a wall built by the Britons running from north to south. There are no walls built at this time running north to south.
He concluded that they belonged to a Roman-era witch or prostitute.
b) is it the only Anglo-Saxon structure of its kind?
He worked for ABC News and Good Morning America for nearly 6 years.
Before creating and producing the site, Greg spent nearly 9 years as a network and investigative correspondent.
With the exception of Carbon-14, radiometric dating is used to date either igneous or metamorphic rocks that contain radioactive elements such as uranium. Now when the uranium or thorium disintegrates, the alpha particles which are emitted are slowed down by the crystals in which the grains of the uranium- or thorium-bearing minerals are embedded.
And even though various radioactive elements have been used to "date" these rocks, for the most part, the methods are basically the same. This means that if you had some pure uranium-238 with no lead in it, 4.5 billion years later one half of it would have decayed into its stable daughter product (lead-206). Where these alpha particles finally stop, crystal deformation occurs (and) shows up as a discolouration or a darkening of the crystals.