DATING OF ROCK FORMATIONS

DATING OF ROCK FORMATIONS - DATINGOFROCKFORMATIONS...

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DATING OF ROCK FORMATIONS
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INTRODUCTION In this project, we will be studying the dating of rock formations. The dating of rock  formations allows scientists to form a geologic time scale of the earth’s history. The dating of rock  formation allows geologists to discover many facts. Some facts include the age of the Earth,  moon, meteorites, age of fossils (including the early man) timing of glaciations, ages of mineral  deposits, recurrence rates of earthquakes and volcanic eruptions, the history of reversals of  earth’s magnetic field, etc.  Geologists have come a long way on this topic. The rocks being analyzed will be the  analytes. Before fancy technology, scientists used to age rocks through direct evidence and  relative dating. The Law of Superposition went hand in hand with this method. The Law of  Superposition states that in an undisturbed horizontal sequence of rocks, the oldest rock layers  will be on the bottom, with successively younger rocks on top of these. Now, radiometric dating is  most commonly used. Radiometric dating allows scientists to actually determine an age in years,  whereas relative dating only yielded chronological order.  EXPERIMENTAL There are different methods to analyzing this situation. You can see them listed in the  table below.  METHOD BRIEF OVERVIEW Direct evidence Evidence from observations of the rock layers themselves to help determine  the relative age of the rock layers Relative dating A process of placing rocks and geologic structures in the correct  chronological order. This process did not yield ages in number of years Sedimentation  rates Determine the amount of sediment being delivered to the sea by rivers.  Then, calculate how one year’s worth of sediment would be spread over the  ocean floors. This rate is used to convert the thickness of rock from strata 
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DATING OF ROCK FORMATIONS - DATINGOFROCKFORMATIONS...

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