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As was mentioned at the outset of this article, fossil assemblages.
Using fossils simply for identification purposes, Smith constructed a map of the various surface rocks outcropping throughout England, Wales, and southern Scotland.
That is to say, it depends on other sequence-determining principles for establishing its validity.
On the practical side, an index fossil should be distinctive in appearance so as to prevent misidentification, and it should be cosmopolitan both as to geography and as to rock type.
In addition, its fossilized population should be sufficiently abundant for discovery to be highly probable.
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Correlation is, as mentioned earlier, the technique of piecing together the informational content of separated outcrops.
Almost without exception, the relative order of strata defined by fossils has been confirmed by radiometric ages.
Correlation based on the physical features of the rock record also has been used with some success, but it is restricted to small areas that generally extend no more than several hundred kilometres.Only a partial listing of physical characteristics is necessary to indicate the breadth of approach in this area.Such features as colour, ripple marks, mud cracks, raindrop imprints, and slump structures are directly observable in the field.Such an array of attributes represents an ideal, and much stratigraphic geology is rendered difficult because of departure of the natural fossil assemblage from this ideal.Nevertheless, there is no greater testimony to the validity of fossil-based stratigraphic geology than the absolute dates made possible through radioactive measurements.Precambrian rocks must therefore be correlated by means of precise isotopic dating.Tags: Adult Dating, affair dating, sex dating