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Questions and Answers
In Dunham's classification, the sediment is called a grainstone if the grains of a limestone are touching one another and the sediment contains no mud.
In Dunham's classification, the sediment is called a grainstone if the grains of a limestone are touching one another and the sediment contains no mud.
True (A)
A packstone is a carbonate sediment that is grain supported and contains a small percentage of mud.
A packstone is a carbonate sediment that is grain supported and contains a small percentage of mud.
True (A)
A wackestone is a mud supported sediment that contains more than 10 percent grains.
A wackestone is a mud supported sediment that contains more than 10 percent grains.
True (A)
A mudstone is a sediment that is mud supported and contains less than 10 percent grains.
A mudstone is a sediment that is mud supported and contains less than 10 percent grains.
Boundstone is a type of biogenic reef rock.
Boundstone is a type of biogenic reef rock.
Which grain size classification is used for limestone according to Grabau (1903)?
Which grain size classification is used for limestone according to Grabau (1903)?
What is the main criteria for classifying limestones according to Folk?
What is the main criteria for classifying limestones according to Folk?
What are the two main groups of "allochemical Rocks" in Folk's classification?
What are the two main groups of "allochemical Rocks" in Folk's classification?
What is the size range of micrite in microcrystalline allochemical limestone?
What is the size range of micrite in microcrystalline allochemical limestone?
How are the "allochemical Rocks" further subdivided in Folk's classification?
How are the "allochemical Rocks" further subdivided in Folk's classification?
Flashcards
Grainstone
Grainstone
Grains touch, no mud present.
Packstone
Packstone
Grain-supported with a small percentage of mud.
Wackestone
Wackestone
Mud-supported with more than 10% grains.
Mudstone
Mudstone
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Boundstone
Boundstone
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Calcarenite
Calcarenite
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Folk's Limestone Classification Key
Folk's Limestone Classification Key
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Folk's Allochemical Rock Groups
Folk's Allochemical Rock Groups
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Micrite Size
Micrite Size
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Folk's Subdividing Allochemical Rocks
Folk's Subdividing Allochemical Rocks
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Study Notes
Dunham's Classification of Limestones
- Grainstone: Limestone where grains touch each other without any mud content.
- Packstone: Carbonate sediment that is grain-supported and has a small amount of mud.
- Wackestone: Mud-supported sediment containing more than 10% grains.
- Mudstone: Mud-supported sediment with less than 10% grains.
- Boundstone: Biogenic reef rock type that includes cemented sediments from biological activity.
Grain Size Classification
- Grabau (1903): Introduced a classification system for limestone based on grain size.
Classification Criteria according to Folk
- The primary criterion for classifying limestones involves the relative amounts of grains and matrix.
Allochemical Rocks in Folk's Classification
- Two main groups of allochemical rocks include grains (such as ooliths and peloids) and cement.
Micrite Size Range
- Micrite in microcrystalline allochemical limestone typically falls within a specific grain size range, measured in micrometers.
Subdivision of Allochemical Rocks
- Allochemical rocks are subdivided further based on the composition and size of their constituents, which can include various types of grains and matrix materials.
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