18 Questions
What type of clast shape is formed when the edges of equally spaced fracture planes in all directions are rounded off?
Equant
Which type of clast shape is less common and forms mainly from metamorphic rocks with a strong linear fabric?
Rod-shaped or prolate
What is the relationship between imbrication and flow direction as clasts settle?
Imbricated clasts dip upstream
What type of rocks are most likely to form elongated clasts due to breaking along the foliation plane?
Metamorphic rocks
What is the typical dip angle of sand grains showing well-developed imbrication?
Less than 20°
What term is used to describe the overlapping arrangement of particles, like that of shingles on a roof?
Imbrication
Which of the following statements about clastic sedimentary rocks is correct?
Clastic sedimentary rocks are derived from the erosion and weathering of pre-existing rocks.
What is the term used to describe the size, shape, and arrangement of grains or particles in a sedimentary rock?
Fabric
Which of the following best describes the term 'clast'?
A particle or fragment derived from the erosion and weathering of pre-existing rocks.
What is the term used to describe the fine-grained material surrounding larger particles in a sedimentary rock?
Matrix
Which of the following terms refers to the physical characteristics and mineral composition of a sedimentary rock?
Lithology
Which of the following statements about grain size in sedimentary rocks is correct?
Grain size can range from clay particles measured in microns to boulders measured in meters.
Which of the following is NOT a factor that influences the texture of siliciclastic rocks?
Grain sorting
What is the term used to describe the spatial arrangement and orientation of grains in a sedimentary rock?
Fabric
Which of the following grain size classes is defined by a range of $4-63 \ ext{mu} m$?
Silt
Which term is used to describe a conglomerate where the clasts are angular in shape?
Breccia
Which term is used to describe a conglomerate where the clasts are composed of only one type of rock?
Monomict
Which textural characteristic of a conglomerate indicates that it was deposited by bedload transport, like in a river?
Clast-supported
Test your knowledge on the classification of sedimentary rocks, including detrital/siliciclastic, carbonate, and other sedimentary rocks such as evaporites and cherts. Focus on terrigenous clastic sediments like gravel, sand, and mud.
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