Why are the lowest stratified rocks regarded as of mechanical origin?
What changes have they undergone?
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?
Fig. 48.
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?