Characteristics contemporary dating

The basis for assuming that like fossils indicate contemporary formation is faunal succession.

characteristics contemporary dating-53

The more ways in which two rocks are physically alike, the more likely it is that the two formed at the same time.

Only a partial listing of physical characteristics is necessary to indicate the breadth of approach in this area.

Suppose, too, that all the layers contain a good representation of the animal life existing at the time of deposition.

From an examination of such outcrops with special focus on the sequence of animal forms comes the empirical generalization that the faunas of the past have followed a specific order of succession, and so the relative age of a fossiliferous rock is indicated by the types of fossils it contains.fossil assemblages.

In other words, the fossil species must have had a short temporal range.

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.

That is to say, it depends on other sequence-determining principles for establishing its validity.

Suppose there exist a number of fossil-bearing outcrops each composed of sedimentary layers that can be arranged in relative order, primarily based on superposition.

Presumably if all the world’s outcrops were integrated, sediments representing all of geologic time would be available for examination.

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