ASBOG FG Terms Test with Complete
Solutions
Blind Thrust - correct Answer-A thrust fault that does not reach the ground surface
detachment fault - correct Answer-A low-angle normal fault associated with regional
extension
Dip-slip Fault - correct Answer-A fault in which the movement is parallel to the dip of the
fault. (ex. normal, reverse, or listric fault)
Fenster - correct Answer-A "window" into rocks underlying a thrust fault
Footwall block - correct Answer-The block that underlies a non-vertical fault
Ga - correct Answer-Giga-annum; one billion years
GIS - correct Answer-Geographic Information System
GPS - correct Answer-Global Positioning System
Growth Fault - correct Answer-A fault that forms contemporaneously with deposition in
sedimentary rock. The throw increases with depth and the sedimentary units on the
downthrown side are thicker than the corresponding units on the upthrown side
Hanging-wall block - correct Answer-The block that overlies a non-vertical fault
Heave - correct Answer-The amount of horizontal displacement on a fault
Ka - correct Answer-Kilo-annum; one thousand years
Klippe - correct Answer-An outlier of a thrust sheet completely surrounded by the
exposed footwall
Key Beds - correct Answer-A well-defined, easily identified strata that is distinctive
enough to be useful in correlation in mapping
Listric Fault - correct Answer-A fault with a curved fault plane. Near the surface the fault
plane is steeply dipping, but it becomes progressively flatter with depth. Listric faults
may be normal or reverse.
, Ma - correct Answer-Mega-annum; one million years
Magnetic Declination - correct Answer-true north - magnetic north
Nappe - correct Answer-A sheetlike rock unit that has moved over other rocks
(allochthonous) on a predominantly horizontal surface
Net Slip - correct Answer-distance between two formerly adjacent points on other side
of the fault
Nonconformity - correct Answer-an uncomformity formed by older igneous rocks in
contact with younger sediments, indicating a missing time after the igneous intrusion
Normal Fault - correct Answer-dip-slip fault in which the hanging wall drops down
relative to the footwall (Dip: 45-90 deg)
Oblique-slip Fault - correct Answer-A fault in which movement is not parallel to the strike
or dip of the fault plane
Offset - correct Answer-The horizontal component of displacement measured
perpendicular to the strike of the disrupted unit
Reverse Fault - correct Answer-a dip-slip fault on which the hanging wall block has
moved upward relative to the footwall block (Dip: 45-90 deg)
Rule of V's - correct Answer-The outcrop pattern of a formation as it crosses a valley
forms a V shape (as viewed on a map). The V points in the direction that the formation
underlies the valley
State Plane Coordinate system - correct Answer-A two dimensional coordinate system
developed by the National Geodetic Survey for use in states and countries
Strike Separation - correct Answer-The horizontal distance between a stratigraphic unit
offset by a fault, measured along the strike of the fault. It is an apparent displacement.
strike-slip fault - correct Answer-A fault in which movement is parallel to the strike of the
fault plane
Throw - correct Answer-The amount of vertical displacement on a fault, also, the vertical
component of net slip
Thrust fault - correct Answer-A reverse fault in which the fault plane dips less than 45
degrees.
Solutions
Blind Thrust - correct Answer-A thrust fault that does not reach the ground surface
detachment fault - correct Answer-A low-angle normal fault associated with regional
extension
Dip-slip Fault - correct Answer-A fault in which the movement is parallel to the dip of the
fault. (ex. normal, reverse, or listric fault)
Fenster - correct Answer-A "window" into rocks underlying a thrust fault
Footwall block - correct Answer-The block that underlies a non-vertical fault
Ga - correct Answer-Giga-annum; one billion years
GIS - correct Answer-Geographic Information System
GPS - correct Answer-Global Positioning System
Growth Fault - correct Answer-A fault that forms contemporaneously with deposition in
sedimentary rock. The throw increases with depth and the sedimentary units on the
downthrown side are thicker than the corresponding units on the upthrown side
Hanging-wall block - correct Answer-The block that overlies a non-vertical fault
Heave - correct Answer-The amount of horizontal displacement on a fault
Ka - correct Answer-Kilo-annum; one thousand years
Klippe - correct Answer-An outlier of a thrust sheet completely surrounded by the
exposed footwall
Key Beds - correct Answer-A well-defined, easily identified strata that is distinctive
enough to be useful in correlation in mapping
Listric Fault - correct Answer-A fault with a curved fault plane. Near the surface the fault
plane is steeply dipping, but it becomes progressively flatter with depth. Listric faults
may be normal or reverse.
, Ma - correct Answer-Mega-annum; one million years
Magnetic Declination - correct Answer-true north - magnetic north
Nappe - correct Answer-A sheetlike rock unit that has moved over other rocks
(allochthonous) on a predominantly horizontal surface
Net Slip - correct Answer-distance between two formerly adjacent points on other side
of the fault
Nonconformity - correct Answer-an uncomformity formed by older igneous rocks in
contact with younger sediments, indicating a missing time after the igneous intrusion
Normal Fault - correct Answer-dip-slip fault in which the hanging wall drops down
relative to the footwall (Dip: 45-90 deg)
Oblique-slip Fault - correct Answer-A fault in which movement is not parallel to the strike
or dip of the fault plane
Offset - correct Answer-The horizontal component of displacement measured
perpendicular to the strike of the disrupted unit
Reverse Fault - correct Answer-a dip-slip fault on which the hanging wall block has
moved upward relative to the footwall block (Dip: 45-90 deg)
Rule of V's - correct Answer-The outcrop pattern of a formation as it crosses a valley
forms a V shape (as viewed on a map). The V points in the direction that the formation
underlies the valley
State Plane Coordinate system - correct Answer-A two dimensional coordinate system
developed by the National Geodetic Survey for use in states and countries
Strike Separation - correct Answer-The horizontal distance between a stratigraphic unit
offset by a fault, measured along the strike of the fault. It is an apparent displacement.
strike-slip fault - correct Answer-A fault in which movement is parallel to the strike of the
fault plane
Throw - correct Answer-The amount of vertical displacement on a fault, also, the vertical
component of net slip
Thrust fault - correct Answer-A reverse fault in which the fault plane dips less than 45
degrees.
