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Questions and Answers
What is a biostratigraphic unit characterized by?
What is a biostratigraphic unit characterized by?
What is the main purpose of defining a biostratigraphic unit?
What is the main purpose of defining a biostratigraphic unit?
What is a biostratigraphic unit composed of?
What is a biostratigraphic unit composed of?
What is unique about the fossil content of a biostratigraphic unit?
What is unique about the fossil content of a biostratigraphic unit?
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What is the primary characteristic that defines a biostratigraphic unit?
What is the primary characteristic that defines a biostratigraphic unit?
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What can be used to date and characterize a unit of strata?
What can be used to date and characterize a unit of strata?
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What is biostratigraphy closely allied to?
What is biostratigraphy closely allied to?
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What is the primary focus of biostratigraphy?
What is the primary focus of biostratigraphy?
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What can be used to reconstruct the geologic history of an area?
What can be used to reconstruct the geologic history of an area?
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What is the relationship between biostratigraphy and paleontology?
What is the relationship between biostratigraphy and paleontology?
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What type of correlation is preferred by biostratigraphers?
What type of correlation is preferred by biostratigraphers?
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What is chronostratigraphic correlation based on?
What is chronostratigraphic correlation based on?
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Why do biostratigraphers not prefer correlation based on local provinces?
Why do biostratigraphers not prefer correlation based on local provinces?
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What is the main purpose of chronostratigraphic correlation?
What is the main purpose of chronostratigraphic correlation?
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What is the difference between chronostratigraphic correlation and biostratigraphic correlation?
What is the difference between chronostratigraphic correlation and biostratigraphic correlation?
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What are the two broad categories of methods for establishing time-stratigraphic correlation?
What are the two broad categories of methods for establishing time-stratigraphic correlation?
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What type of zones are used in time-stratigraphic correlation by biological methods?
What type of zones are used in time-stratigraphic correlation by biological methods?
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What is the chapter where physical/chemical methods are discussed?
What is the chapter where physical/chemical methods are discussed?
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What are taxon range and interval zones that constitute?
What are taxon range and interval zones that constitute?
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What is the characteristic of different biozones in time-stratigraphic correlation?
What is the characteristic of different biozones in time-stratigraphic correlation?
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What is a characteristic of interval biozones defined on the last appearance of taxa?
What is a characteristic of interval biozones defined on the last appearance of taxa?
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What happens to taxa in the fossil record?
What happens to taxa in the fossil record?
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What is the significance of the last appearance of taxa in a biozone?
What is the significance of the last appearance of taxa in a biozone?
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What is true about the extinction of taxa?
What is true about the extinction of taxa?
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What is the relationship between the extinction of taxa and the appearance of new species?
What is the relationship between the extinction of taxa and the appearance of new species?
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Study Notes
Biostratigraphy and Fossil Content
- Any unit of strata can be dated and characterized by its fossil content.
- Biostratigraphy is closely allied to paleontology.
Biostratigraphic Units
- A biostratigraphic unit is a body of rock strata characterized by its fossil content that differentiates it from adjacent strata.
- Interval biozones defined on the last (stratigraphically highest) appearance of taxa commonly have less time significance.
- Extinction of taxa is not sudden, as new species appear.
Correlation Methods
- Chronostratigraphic correlation is the matching up of stratigraphic units on the basis of time equivalence.
- Methods for establishing time-stratigraphic correlation fall into two broad categories: biological and physical/chemical.
Biological Correlation Methods
- Time-stratigraphic correlation by biological methods is based mainly on the use of concurrent range zones and other interval zones.
- Taxon range and interval zones are biozones that constitute the strata that fall between the highest and/or the lowest occurrence of strata.
Characteristics of Biozones
- The different biozones have varying degrees of usefulness in time-stratigraphic correlation.
- Biostratigraphers usually prefer correlation based on assemblage biozones or taxon-range or interval biozones.
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Description
Learn about the relationship between biostratigraphy and fossil content, and how it is closely tied to paleontology. Understand the significance of fossil content in dating strata units.
