sedimentary structures Flashcards

1
Q

list of sed. structures

A
cross bedding
graded bedding 
flute casts
imbricate structure
salt pseudomorphs
desication cracks ripple marks
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2
Q

sed structures found on bedding planes

A

flute cast
ripple marks
desication cracks

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3
Q

sed structures found within beds

A

salt pseuodomorphs
graded bedding
cross bedding
imbricate structure

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4
Q

way up/paelocurrent indicator? CROSS BEDDING

A

both

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5
Q

way up/paelocurrent indicator? GRADED BEDDING

A

way up

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6
Q

way up/paelocurrent indicator? IMBRICATE STRUCTURE

A

paelo current

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7
Q

way up/paelocurrent indicator? SALT PUESDOMORPHS

A

none

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8
Q

way up/paelocurrent indicator? RIPPLE MARKS

A

yes (paelocurrent if assymetical)

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9
Q

way up/paelocurrent indicator? DESICATION CRACKS

A

way up

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10
Q

way up/paelocurrent indicator? FLUTE CASTS

A

both

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11
Q

angle of cross bedding

A

less than 37 degrees

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12
Q

turbitity flow indicators

A

flute casts

sometimes graded bedding

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13
Q

what is the difference between symettrical and assymetrical ripple marks

A

symetrical: water flows both ways i.e. beach slatating grains move both ways with swash and backswash
assymetrical: water flows one way, indicating direction of current, as saltation carries graisn

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14
Q

where do desication cracks form

A

in clay- rich sediments

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15
Q

what is a flute cast

A

found at bottom of a bed
result of erosion caused by turbulent flow (usually over soft mud)
form parallel to current
deeper the more upstream

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