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    Since its initial posting in early 2005, the Historic Bottle Website has become a very useful resource to the historical archaeology community. Talking about fifth base when there's really only four bases reminds me of the expression Up To Eleven.

    What is a type of relative dating of fossils

    Sometimes, scientists already know the age of the fossil because fossils of the same species have been found elsewhere and it has been possible to establish accurately from those when the dinosaur lived.Geologists call this the principle of lateral continuity.Different methods have their own limitations, especially with regard to the age range they can measure and the substances they can date.A common problem with any dating method is that a sample may be contaminated with older or younger material and give a false age.Discover how geologists study the layers in sedimentary rock to establish relative age.

    Stratigraphy uses the assumption that higher layers or strata were laid down after lower layers.

    Instead, other methods are used to work out a fossil’s age.

    These include radiometric dating of volcanic layers above or below the fossils or by comparisons to similar rocks and fossils of known ages.

    Sedimentary rocks are rarely useful for dating because they are made up of bits of older rocks.

    Uranium is present in many different rocks and minerals, usually in the form of uranium-238.

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