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Principles of relative age dating Black girls 3g video sex chat

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It provides the geologic underpinning for the theory of evolution.

Example: Bed 1 at the base contains fossil species A, Bed 2 contains fossil species A and B, Bed 3 contains B and C, Bed 4 contains C, and so on.

From these data, we can define the range of specific fossils in the sequence, meaning the interval in the sequence in which the fossils occur.

The sequence contains a definable succession of fossils (A, B, C, D, E, F), that the range in which a particular species occurs may overlap with the range of other species, and that once a species vanishes, it does not reappear higher in the sequence.

Such species are called index fossils (or guide fossils), because they can be used by geologists to associate the strata with the specific time interval.

On this page, we will discuss the Principles of Geology.

Building from the work of Steno, Hutton, and others, the British geologist Charles Lyell (1797–1875) laid out a set of formal, usable geologic principles.

These principles continue to provide the basic framework within which geologists read the record of Earth history and determine relative ages.

Original horizontality: The principle of original horizontality states that layers of sediment, when first deposited, are fairly horizontal because sediments accumulate on surfaces of low relief (such as floodplains or the sea floor) in a gravitational field.

Investors decided to construct a network of canals to transport coal and iron, and hired an engineer named William Smith (1769–1839) to survey some of the excavations.

Canal digging provided fresh exposures of bedrock, which previously had been covered by vegetation.

Once the relative ages of a number of fossils have been determined, the fossils can be used to determine the relative age of the beds containing them.

For example, if a bed contains Fossil F (from the succession specified above), geologists can say the bed is older than a bed containing Fossil A, even if the two beds do not crop out in the same area.