Sedimentary rocks

Question 1

What grain size is orthoquartzite?

Answer 1

Arenaceous

Question 2

What is the sorting and grain shape of orthoquartzite?

Answer 2

Well sorted

Round

Question 3

What colour are orthoquartzite?

Answer 3

White

Grey

Question 4

Where is orthoquartzite often form?

Answer 4

Beach

Shallow Marine deposits

Question 5

What is the composition of orthoquartzite?

Answer 5

Silicic

Question 6

What is the grain size of arkose?

Answer 6

Arenaceous

Question 7

What is the composition of arkose?

Answer 7

Mafic

Question 8

What is the grain shape and sorting of arkose?

Answer 8

Sub-angular to sub-rounded

Moderately sorted

Question 9

What is the colour of arkose?

Answer 9

Pink

Question 10

What is the colour of greywacke?

Answer 10

Dark coloured

Question 11

What is the composition of greywacke?

Answer 11

Mafic

Question 12

What is the grain size of greywacke?

Answer 12

Arenaceous

Question 13

What is the grain shape and sorting of greywacke?

Answer 13

Poorly sorted

Angular to sub-angular grains

Question 14

What is the grain size of mudstone?

Answer 14

Argillaceous

Question 15

What is the mineral composition of mudstone?

Answer 15

Clay

Mica

Quartz

Question 16

Mudstone

Answer 16

Contains mud - particles of clay and fine silt

Less then 10% grains

Mud supported

Question 17

Wackestone

Answer 17

More than 10% grains

Contains mud - clay and fine silt

Mud supported

Question 18

Packstone

Answer 18

Grain supported

Question 19

Grainstone

Answer 19

Lacks mud

Question 20

What grain size is breccia?

Answer 20

Rudaceous

Question 21

What sorting is breccia?

Answer 21

Poorly sorted

Question 22

What is the grain shape of breccia?

Answer 22

Angular

Question 23

Where do breccia usually form?

Answer 23

Scree

Alluvial fans

Wadi deposits

Question 24

What is the grain size of conglomerate?

Answer 24

Rudaceous

Question 25

What is the sorting of a conglomerate?

Answer 25

Poorly sorted

Question 26

What is the grain shape of conglomerate?

Answer 26

Rounded

Question 27

What colours can clay be?

Answer 27

Brown Red Green

Question 28

Why is shale fissile?

Answer 28

Rock easily splits along the laminations of the rock.

Question 29

What are the two groups of limestone?

Answer 29

Chemical limestone formed by the precipitation of CaCO3 from sea water. Biological limestone formed from organic remains remains such as shell fragments.

Question 30

What are ooliths surrounded by in oolitic limestone?

Answer 30

Fine grained calcite mud matrix (micrite) or crystalline calcite cement (sparite)

Question 31

Where does oolitic limestone form?

Answer 31

Sub-tropical seas, in shallow water agitated by high energy waves

Question 32

What type of limestone is oolitic limestone?

Answer 32

Chemical

Question 33

What type of limestone is fossiliferous limestone?

Answer 33

Biological

Question 34

How would you describe fossiliferous limestone?

Answer 34

Bioclastic

Question 35

What is chalk?

Answer 35

Biologically formed limestone Composed of coccoliths Pure CaCO3 Low energy, deep water shelf environments

Question 36

What is the grain size for argillaceous rocks?

Answer 36

<0.0625mm

Question 37

What is the grain size for arenaceous rocks?

Answer 37

0.0625-2mm

Question 38

What is the grain size for rudaceous rocks?

Answer 38

>2mm