copyright 2015-Roger Weller
last edited: 11/28/15
-consists of a set of sedimentary layers deposited on an erosion
surface which is underlain by inclined sedimentary beds that are
truncated by the erosion surface and then capped with sedimentary
layers parallel to the erosion surface.
-Angular unconformity near Benson, Arizona
-is a hill-shaped fold.
near Tombstone, Arizona
-anticline and syncline near Hayden, Arizona
-is a tectonic structure in
which layers of sedimentary rock formed
into a circular depression.
A basin is the opposite of a dome.
-Maps of the Michigan Basin
basin and range faulting
-consists of a series of
fault block mountains (horsts) separated
by basins formed by down-dropped blocks (grabens).
Basin and Range province
-refers to the southwest
portion of the United States that is dominated by basin and
basin and range topography
-describes the resulting
land surface of mountains separated by valleys that is produced
by basin and range faulting.
-refers to a material has a tendency to break or crush. A brittle material is not tough.
-is a squeezing force that tends to flatten an object.
-describes the angle by
which an inclined plane, such as a sedimentary bed or a fault
surface, is tilted from the horizontal.
-is a type of fault in which the relative movement of the two fault blocks is in the dip direction.
-is a fold that is created
when one sedimentary rock layer is dragged across another during
folding or faulting.
-drag fold in the Santa Catalina Mountains
-is used to describe
materials, which after being distorted, tend to snap back to their original,
-is a break in the planet's crust along which there has been movement.
-turbidites cut by fault
-is the large mass of rock
located on one side of a fault. Sometimes this term refers to a single
very large mass of
rock surrounded on all sides by faults.
-consists of crushed and ground up rock along a fault zone.
-is more complex than a
single fault. A fault zone consists of a series of faults, all trending in
the same direction and
tectonically related to each other.
-describes bent layers of
-fold in the Huachuca Mountains
-folds in the Santa Catalina Mountains-1
-folds in the Santa Catalina Mountains-2
in the Santa Catalina Mountains-4
-Anticline and Syncline folds south of Tombstone
footwall fault block
-is the fault block underlying a dipping fault surface.
-is a map that shows stratigraphic formations, folds, and faults.
-geologic map of the Whetstone Mountains, Southeastern Arizona
headwall fault block
-is the fault block resting
on top of an inclined fault surface.
-are flat breaks along which there has been little or no movement.
-plants growing in joints in granite *
-joints in granite-1
-joints in granite-2
-is a dip-slip fault where the headwall (upper) fault block slides down dip.
fault cutting turbite beds
-normal fault-Opal's Pals
-are loose, uncompressed
-open folds-Opal's Pals
-occurs when, under pressure, a material flows instead of breaking.
-are a series of folds
whose fold axes are inclined to the horizontal.
-plunging folds-Opal's Pals
San Andreas Fault
Is a prominent strike-slip
fault extending from near Yuma, Arizona, running northeast of Los
Angeles up through San Francisco. The San Andreas Fault separates the Pacific plate on the west
from the North American plate to the east.
-map of the Los Angeles area
-is a small cliff formed
through mass wastage as a slump or landslide or through surface faulting
associated with an earthquake.
-landslide scarp in Colorado
-is the type of stress
where one block slides past another block. Materials caught between the two
blocks are said to be undergoing shear.
-consist of parallel
scratches on the rocks on both sides of a fault surface.
Slickensides are formed when the fault blocks rub
against each other during fault movement.
-slickensides with epidote
-represents the consequences of stress: folds, faults, joints, etc.
-refers to the forces acting upon rocks: compression, tension, or shear
-In order to describe the
orientation of a dipping surface, such as a fault or sedimentary layer, this
term is applied to the compass direction of the line created by the dipping plane intersecting a
-occurs when two fault
blocks move horizontally past each other in opposite directions along the
direction of the strike line.
-strike slip fault-Opal's Pals
-is a valley fold where the
dips of the two limbs of the fold point towards each other.
-syncline-Sideling Hill, Maryland
near Tombstone, Arizona
-syncline and anticline near Hayden, Arizona
-refers to the folds,
faults, and earthquakes within a region that indicate the area is under stress
has been under stress.
-is a force where objects are being pulled apart.
-is a low angle reverse
fault where the headwall block moves up dip. This type of faulting is
caused by horizontal compression.
-thrust Fault-Opal's Pals
-consist of a series of
folds so tightly compressed that the limbs of the folds are nearly parallel to
-tight folds-Opal's Pals
-is a map that indicates elevation of landforms with contour lines.
topographic map of the Mule Mountains