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    Define biostratigraphic dating

    The organization of rock bodies into units on the basis of their lithologic properties and their stratigraphic relations. A lithostratigraphic unit may consist of sedimentary, or igneous, or metamorphic rocks.

    accrete - To add terranes (small land masses or pieces of crust) to another, usually larger, land mass. age - A unit of geological time shorter than an epoch, usually lasting several million years.

    Since each of these layers seems so specialized it is easy to conclude that one type of creature gave rise to the next type of creature over the course of whatever time it took to form the various layers between them.

    Radiometric dating and many other techniques are used to support the idea that this transformation process took tens and hundreds of millions of years.

    Lithostratigraphic units are bodies of rocks, bedded or unbedded, that are defined and characterized on the basis of their lithologic properties and their stratigraphic relations. The element of stratigraphy that deals with the description and nomenclature of the rocks of the Earth based on their lithology and their stratigraphic relations. Lithostratigraphic units are defined and recognized by observable physical features and not by their inferred age, the time span they represent, inferred geologic history, or manner of formation.

    Lithostratigraphic units are the basic units of geologic mapping. The contrast in lithology between formations required to justify their establishment varies with the complexity of the geology of a region and the detail needed for geologic mapping and to work out its geologic history.

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