A texture seen in some schists that results from the intersection of
relict bedding planes with well developed cleavage planes. AGI
a. A map showing features--such as mine workings, geological structures,
and outside improvements--on a horizontal plane.
See also:colliery plan
b. A scheme or project for mine development. See also:planning
Nelson
c. The system on which a colliery is worked, such as longwall,
room-and-pillar, etc. Zern
Lying or arranged as a plane or in planes, usually implying more or less
parallelism, as in bedding or cleavage. It is a two-dimensional
arrangement, in contrast to the one-dimensional linear arrangement.
AGI
a. Cross-bedding in which the lower bounding surfaces are planar surfaces
of erosion. It results from beveling and subsequent deposition.
AGI
b. Cross-bedding characterized by planar foreset beds. AGI
A fabric element having two dimensions that are much greater than the
third; e.g., bedding, cleavage, and schistosity. CF:linear element
AGI
Uniform slippage along plane surfaces. AGI
The widening of valleys through lateral corrasion by streams after they
reach grade and begin to meander and form floodplains. Also, by the
extension, the reduction of divides and the merging of valley plains to
form a peneplain; peneplanation.
a. Any roadway, generally inclined but not necessarily so, along which ore
or workers are conveyed by mechanical means from one bed to another or to
a lower elevation in the same bed. See also:bedding plane; fault plane;
slope. Nelson
b. A road on the natural floor of a seam. Mason
c. A two-dimensional form that is without curvature; ideally, a perfectly
flat or smooth surface. In geology the term is applied to such features as
a bedding plane or a planation surface. Adj: planar. See also:surface
AGI
d. In crystallography, a plane of symmetry dividing a crystal structure
into two mirror images. See also:symbols of crystal faces
e. A level surface bounded by straight lines, such as the faces of
crystals. Gordon
Scot. In the direction facing the joint planes. Syn:on plane
See:slope engineer
A fault with a surface that is planar rather than curved.
A plane surface bounded either by straight lines or curved lines or by a
combination of straight and curved lines. Jones, 2
The 17 possible combinations of symmetry elements which may coexist in 2
dimensions. CF:space group
See:incline man
See:water table
A low-angle gravity (normal) fault resulting from stretching of the
solidified top of an igneous intrusion.
Any plane which divides a crystal, crystal structure, or crystal symmetry
such that each side is a mirror reflection of the other. Represented as m
or 2 and graphically as a solid or heavy line. Syn:mirror plane
plane or rectangular coordinate
Either of two perpendicular distances of a point from a pair of
rectangular coordinate axes. Seelye, 2
Light with its electric vector confined to a plane.