Lesson 3: Grain shape and Fabric

Question 1

Includes all external morphology of particles, including form, roundness, and surface texture.

Answer 1

Grain shape

Question 2

Refers overall morphology of the particle.

Answer 2

Form

Question 3

Refers to the measurement of the sharpness of the corners of the grain.

Answer 3

Roundness

Question 4

Refers to the scratches and pits that appear on the surface.

Answer 4

surface textures

Question 5

The overall shape of the particles approaching the shape of a sphere

Answer 5

Sphericity

Question 6

It contains 5% clay, its framework grains are poorly sorted and poorly rounded.

Answer 6

Immature

Question 7

Have undergone sediment transport and reworking but framework grains are still not well sorted or well rounded and have low clay content.

Answer 7

Submature

Question 8

Framework grains are becoming well sorted but are not well rounded and have a low clay content.

Answer 8

Mature

Question 9

It has no clay and the framework grains are both well sorted and well rounded

Answer 9

Supermature

Question 10

Utilization of space among sediments, as well as the manner of arrangement or spacing of the solid particles

Answer 10

Grain Packing

Question 11

What are the things to consider in grain packing

Answer 11

Size
Sorting
Shape
Orientation
Degree of diagenesis

Question 12

What are the variables of particle orientation?

Answer 12

Nature of flow Current vs Gravity
Bed slopes
Flow velocity
Particle size and shape
Packing density

Question 13

______ is very useful in paleocurrent analysis and paleocurrent directions. It also have an effect on permeability of sedimentary rocks to fluid movements

Answer 13

Particle orientation