SECTION II.

In what state were the stratified rocks deposited? What change have they undergone in this respect? How is the fissile structure produced? How is the cleavage structure produced?

What is the third class of changes?

What do fractures at the surface become by the erosion of water? How are caverns formed?

Describe a vein of segregation. A dike. A mineral vein. What is a fault?

Were the inclined strata thus deposited?

How is it proved that they have taken the inclined position since they were deposited?

What is the direction of the dip?

What lines form the angle of inclination?

What is the outcrop of inclined strata? The strike?

Describe an anticlinal axis. A synclinal axis. A valley of elevation. A valley of subsidence.

When are strata unconformable?

What other disturbances have taken place in the strata?

When did these various disturbances take place?

How is it known that there has been no period of universal disturbance?