Relative dating of geological features

Posted by / 03-Sep-2020 20:27

The succession of events in order of relative age that have produced the rock, structure, and landscape of a region is called the geologic history of the region.We can use these principles to determine relative ages of the features.As we will see, painstaking work over many years eventually allowed geologists to assign numerical age ranges to fossil species.

These principles continue to provide the basic framework within which geologists read the record of Earth history and determine relative ages.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.If a fault cuts across and displaces layers of sedimentary rock, then the fault must be younger than the layers.But if a layer of sediment buries a fault, the sediment must be younger than the fault.

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Thus, once a fossil species disappears at a horizon in a sequence of strata, it never reappears higher in the sequence or, put another way, extinction is forever.