sedimentary structures

Question 1

list of sed. structures

Answer 1

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

Question 2

sed structures found on bedding planes

Answer 2

flute cast
ripple marks
desication cracks

Question 3

sed structures found within beds

Answer 3

salt pseuodomorphs
graded bedding
cross bedding
imbricate structure

Question 4

way up/paelocurrent indicator? CROSS BEDDING

Answer 4

both

Question 5

way up/paelocurrent indicator? GRADED BEDDING

Answer 5

way up

Question 6

way up/paelocurrent indicator? IMBRICATE STRUCTURE

Answer 6

paelo current

Question 7

way up/paelocurrent indicator? SALT PUESDOMORPHS

Answer 7

none

Question 8

way up/paelocurrent indicator? RIPPLE MARKS

Answer 8

yes (paelocurrent if assymetical)

Question 9

way up/paelocurrent indicator? DESICATION CRACKS

Answer 9

way up

Question 10

way up/paelocurrent indicator? FLUTE CASTS

Answer 10

both

Question 11

angle of cross bedding

Answer 11

less than 37 degrees

Question 12

turbitity flow indicators

Answer 12

flute casts

sometimes graded bedding

Question 13

what is the difference between symettrical and assymetrical ripple marks

Answer 13

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

Question 14

where do desication cracks form

Answer 14

in clay- rich sediments

Question 15

what is a flute cast

Answer 15

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