Chemistry, 15.07.2019 09:50 carrieaj08

What do geologists use index fossils for? a. dating of rock layers b. identifying the type of rock in a rock layer c. providing evidence of climate change d. tracking migration of prehistoric species

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Answer from: rehel5106

A. dating of rock layers is the answer i believe.

Answer from: lillyawesome28

Geologists use index fossils for dating of rock layers

Geologists use index fossils to determine the age of rocks. Index fossils are also known as key fossils; they define dating of rock layers.

Further Explanation

Some of the characteristics of fossil index include:

It is widespread Not many in geologic time It is also distinctive

Index fossils are defined as “commonly found” because they are widespread but limited in a period of time. If an index fossil is found in a particular layer, the layer will determine the age of the layer, therefore with the use of index fossils, one can easily define the geological periods. In many cases, the geological periods can last as far as tens of millions of years.

Index fossils have a very short life span, therefore the age at which they are found defines their age. They are used to determine the period and eras of the geological time scale.

Geological time scale is also known as GTS, it refers to a system of dating which relates stratigraphy to time. Geological time scale is used by Geologists to determine the period and the relationship of events that have taken place in the history of the earth.

Therefore, Geologists use index fossils for dating of rock layers

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Describe why index fossils are useful to geologists Index fossils allow geologists

KEYWORDS:

rock layersindex time scalewidespread

Answer from: Quest

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.

Answer from: Quest

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

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What do geologists use index fossils for? a. dating of rock layers b. identifying the type of rock...

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