Worksheetssedimentary structures
Total questions: 15
Worksheet time: 8mins
Which type of sedimentary structure is a definite indicator of tidal current?
Epsilon cross bedding
Hummocky cross bedding
Herring -bone cross bedding
Through cross bedding
Allochem in a limestone consist of
Micrite only
Spar only
Ooids only
Bioclasts and ooids
In flow regime ,the 'bedform' formed with increasing current velocities are:
Dune-ripple- plane beds- antidune
Ripples - Dune -plane beds -antidune
Antidunes -dunes -ripples-plane beds
Plane beds -ripples -Dunes -Antidunes
Coarse grained sediments are transported by:
Traction process
Saltaion process
Suspension process
None
Coarse grained sediments are transported by:
Traction process
Saltaion process
Suspension process
None
In what environment do symmetrical ripples most likely form
Beach(wave )
Desert(wind)
Alluvial(Stream)
Glacial
Which of the following contains the coarse grained sediments?
Top set bed
Fore set bed
Bottomset bed
Coset bed
Aeolian ripples are characterised by the presence of:
Coarse grain on the crests
Finer grain on the crest
Uniformly even grain on the crests and the trough
None of the above
In which of the following environments would you expect to find oscillation ripples
Alluvial
Beach
Deep sea
Desert
Which of the environment will produce sediments with cross bedding
Deep Ocean
Swamp
Tropical rain forest
Desert
Hummocky cross stratification is a product. of storm induced unidirectional current and they are generally formed in following depositional areas of a marine basin
Outer shelf region
Inner shoreface region
Foreshore region
Outer shoreface region
Unusually wide wave -cut platform is created if the rate of sea-level rise is
Slightly greater than the rock
Zero and the rock uplift is rapid
Slightly lower than the rock uplift
Significantly lower than the rock uplift
Water formed wave ripple mark have a ripple index :
<15
<30
<20
<25
Which of the following structures are typical of sandy beaches
1.Swash mark ,2.Rill mark ,3.Flute mark, 4. Browsig traces
1,2&4
2,3&4
2 only
1,3&4
Cross bedding in limestone implies
In situ precipitation of carbonate fluvil environment
In situ precipitation of carbonate in Lake environment
In situ precipitation of carbonate in marine environment
Reworking of carbonate in depositional environment
