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In dating the past, the primary value of fossils lies within the principle of faunal succession: each interval of geologic history had a unique fauna that associates a given fossiliferous rock with that particular interval.index fossil should be such as to guarantee that its presence in two separated rocks indicates their synchroneity.
Almost without exception, the relative order of strata defined by fossils has been confirmed by radiometric ages.Such features as colour, ripple marks, mud cracks, raindrop imprints, and slump structures are directly observable in the field.Properties derived from laboratory study include (1) size, shape, surface appearance, and degree of sorting of mineral grains, (2) specific mineral types present and their abundances, (3) elemental composition of the rock as a whole and of individual mineral components, (4) type and abundance of cementing agent, and (5) density, radioactivity, and electrical-magnetic-optical properties of the rock as a logging, involves lowering a small instrument down a drill hole on the end of a wire and making measurements continuously as the wire is played out in measured lengths.Correlation may be difficult or erroneous if several different ash eruptions occurred, and a layer deposited in one is correlated with that from another.Even then, the correlation may be justified if the two ash deposits represent the same volcanic episode.
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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.