Lecture 2.4 - Sedimentary Rocks

Question 1

Mass movement terminology: How did it move? List all movements and their combinations

Answer 1

1. Slide = coherent + distinct surface
2. Flow = breaks apart + irregular surface
3. Fall = drop through open air

Question 2

Mass movement terminology: what moved? List all movements and their combinations

Answer 2

1. Rock = large pieces of bedrock
2. Earth = fine soil
3. Debris = mix

Question 3

Define creep

Answer 3

Slow + shallow earth slide

Question 4

Define slump

Answer 4

Debris slide _ debris flow at bottom

Question 5

PH scale

Answer 5

1-6 = acidic
7 = neutral
8-14 = acidic

Question 6

What are the 3 textures to know

Answer 6

1. Grave
2. Sand
3. Mud

Question 7

Characteristics of breccia

Answer 7

Clastic sedimentary + gravel + angular

Question 8

Characteristics of conglomerate

Answer 8

Clastic sedimentary + gravel + rounded

Question 9

Characteristics of quarts sandstone

Answer 9

Clastic sedimentary + sand + M > 90% quartz

Question 10

Characteristics of lithic sandstone

Answer 10

Clastic sedimentary + sand + M = rocks fragments

Question 11

Characteristics of arkose

Answer 11

Clastic sedimentary + sand + M > 20% K-feldspar

Question 12

Characteristics of graywacke

Answer 12

Clastic sedimentary + sand with some mud

Question 13

Define fissility

Answer 13

Ability/tendency of a rock to split along flat planes of weakness

Question 14

Characteristics of shale

Answer 14

Clastic sedimentary + mud + orientation to flakes (fissility)

Question 15

Characteristics of mudstone

Answer 15

Clastic sedimentary + mud-sized clasts + no fissility (almost a semi-conchoidal fracture