Question:
According to Dunham’s classification, which one of the following limestones is grain-supported and contains mud?
According to Dunham’s classification, which one of the following limestones is grain-supported and contains mud?
Show Hint
To classify limestones, focus on the proportion of grains and mud. The key difference between Packstone and Grainstone is the presence of mud in Packstone.
Updated On: Sep 6, 2025
- Wackestone
- Packstone
- Grainstone
- Mudstone
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understand Dunham’s Classification.
Dunham’s classification of limestones is based on the amount of mud and the grain-supported nature of the limestone.
- Wackestone: Mud-supported limestone with grains embedded in mud.
- Packstone: Grain-supported limestone with mud filling the intergranular spaces.
- Grainstone: Grain-supported limestone with minimal or no mud.
- Mudstone: Mud-supported limestone without significant grains.
Step 2: Identify the Correct Limestone Type.
A Packstone is grain-supported and contains mud, making it the correct classification for this question.
Thus, the correct answer is Packstone. Final Answer: \[ \boxed{\text{Packstone}} \]
Dunham’s classification of limestones is based on the amount of mud and the grain-supported nature of the limestone.
- Wackestone: Mud-supported limestone with grains embedded in mud.
- Packstone: Grain-supported limestone with mud filling the intergranular spaces.
- Grainstone: Grain-supported limestone with minimal or no mud.
- Mudstone: Mud-supported limestone without significant grains.
Step 2: Identify the Correct Limestone Type.
A Packstone is grain-supported and contains mud, making it the correct classification for this question.
Thus, the correct answer is Packstone. Final Answer: \[ \boxed{\text{Packstone}} \]
Was this answer helpful?
0
0
Top IIT JAM GG Geology Questions
- The mineral assemblage found in a granulite facies metabasalt is
- Glossopteris is found in which of the following formations?
- In a sequence of undeformed sedimentary rocks, younger rocks overlie older rocks. This conforms to the principle of
- Dropstones are found in
- The sedimentary structure formed by unidirectional current is
View More Questions
Top IIT JAM GG Applied Geology Questions
- The saturated thickness of an unconfined aquifer is defined by the distance between
- Darcy’s law quantifies the volume of groundwater flow
- The mean flow velocity of water in an open channel having an average depth of 0.2 m, and with Froude Number 4, is ________ m/s. (Round off to one decimal place) (Use $g = 9.8 ms^{-2}$)
- An aquifer has a cross-sectional area of 10 $m^2$ and a hydraulic conductivity of 0.25 cm/s. The volume of water that will flow per second through the aquifer for a hydraulic gradient of 0.04 is _____ $cm^3$. (Round off to three decimal places)
- The geothermal gradient in the continental crust is 0.02 ⁰C/m. If the surface temperature is 25 ⁰C, the temperature at a depth of 18 km from the surface is ________ ⁰C. (In integer)
View More Questions
Top IIT JAM GG Questions
- The mineral assemblage found in a granulite facies metabasalt is
- Glossopteris is found in which of the following formations?
- In a sequence of undeformed sedimentary rocks, younger rocks overlie older rocks. This conforms to the principle of
- Dropstones are found in
- The sedimentary structure formed by unidirectional current is
View More Questions