Exam 6: Geologic Structures

The axial plane divides a fold into top and bottom portions.

On a geologic map,a symbol that looks like a cross indicates ____.

Collectively,the San Andreas fault system of California is a(n)_____.

_____ folds have limbs that dip gently and the angle between the limbs is large.

A map symbol similar to the letter "T" is used to record ______ on a map.

If a deformed material recovers its original shape after stress is reduced,the behavior is __.

A strike-slip fault can be right lateral or left lateral.

_____ stress results in rocks being shortened or flattened.

On a surface leveled by erosion the pattern of exposed beds of a plunging fold resembles that of the letter __.

A thrust fault is ____.

_____ are fractures in bedrock along which sliding movement has taken place.

A fault in which movement is predominantly horizontal and parallel to a strike is called a strike-slip fault.

A(n)____ trap is one of the best structures for holding oil.

A rock that behaves in a ductile manner will bend under stress but will not return to its original shape.

The oldest rocks are found in the center of an eroded anticline.

The definition of an open fold is one with a horizontal hinge line.

Normal and reverse faults are the most common types of _____.

A syncline is a fold shaped like an arch,with the oldest rocks in the center.

The San Andreas Fault system can be described as _________.

Once stress exceeds the elastic limit the rock will deform in a permanent way.