Question: What are three characteristics of a good index fossil?

A good index fossil is one with four characteristics: it is distinctive, widespread, abundant, and limited in geologic time. Because most fossil-bearing rocks formed in the ocean, the major index fossils are marine organisms.

What are the characteristics of a good index fossil?

A useful index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time. Index fossils are the basis for defining boundaries in the geologic time scale and for the correlation of strata.

What are the characteristics of a good index fossil quizlet?

Characteristics of index fossils: Easily recognizable, short lived (found only in a few layers of rock worldwide), wide distribution (geographic range). A key example of an index fossil; a group of hard-shelled animals whose bodies had three sections, lived in shallow seas, and became extinct about 245mm years ago.

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Which two characteristics describe a good index fossil Brainly?

Explanation: The two characteristics of fossil that make it good index fossil are: A good index fossil is recognizable, widespread and abundant.

Which fossil could be a good index fossil?

Trilobites serve as good index fossils, letting geologists date the age of the rocks that they are in.

What four characteristics are best for an index fossil to have?

A good index fossil is one with four characteristics: it is distinctive, widespread, abundant, and limited in geologic time. Because most fossil-bearing rocks formed in the ocean, the major index fossils are marine organisms.

Will humans be a good index fossil?

Some fossils are more useful than others in establishing the age of rocks. These are called index fossils. … It is possible that humans also will be good index fossils at some time in the distant future. Humans have distinct hard parts, and we often bury our dead.

What are the 2 most common index fossils?

the most common index fossils are shells of invertebrates. give two reasons why this is so. fusulinids make good index fossils. they are very abundant in marine sediment, widely distributed, and existed during a specific period in time.

What is not a characteristic of index fossils?

Why are many fossils not considered index fossils? Because if it is not widespread or huge time frame than hard to find. Also organisms found all over the world – bc continent may have been connected. Why did Al Wegener choose the index fossils that he did to develop his ideas on Continental Drift?

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What are the two best environments to look for fossils?

It is often found in deserts, beaches, and other sandy environments. Shale is formed from particles of mud. Good places to find fossils are outcrops. An outcrop is a place where old rock is exposed by wind and water erosion and by other people’s digging.

Why do you think some rock layers are missing from the sequence in some outcrops?

Explain why some rock layers can be missing from the sequence in some outcrops. They were weathered and eroded or never deposited. reconstruct a sequence of events? We de not need to walk, dig, or identify layers or fossils.

What is an index fossil apex?

A fossil that is more than 60,000 years old. … A fossil found in rocks from one time period.

What is rock correlation?

Correlation is the process of establishing which sedimentary strata are of the same age but geographically separated. Correlation can be determined by using magnetic polarity reversals (Chapter 2), rock types, unique rock sequences, or index fossils.

How do you find a good index fossil?

To find the index fossil you must eliminate any fossils that don’t show up in each rock outcrop and those that show up in more than one layer per outcrop. We can eliminate “fossil 1” because it shows up in multiple layers in the same outcrop.

What are the 5 types of fossils?

Five different types of fossils are body fossils, molds and casts, petrification fossils, footprints and trackways, and coprolites.

What is the important use of index fossils?

Index fossils are used by both geologists and paleontologists to study the rocks and species of the past. They help to give a relative age for the rock layers and other fossils found in the same layer.

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Archeology with a shovel