An orthorhombic mineral, Ca(UO2 )6 O4 (OH)6
.8H2 O , with barium and potassium substitution for calcium;
amber-yellow; a radioactive product of uraninite and ianthinite
alteration.
a. The smallest distinctive division of a stratified series, marked by a
more or less well-defined surface or plane from its neighbors above and
below; a layer or stratum. Fay
b. A deposit, as of ore, parallel to the stratification.
Standard, 2
c. A bed (or beds) is the smallest formal lithostratigraphic unit of
sedimentary rocks. The designation of a bed or a unit of beds as a
formally named lithostratigraphic unit generally should be limited to
certain distinctive beds whose recognition is particularly useful.
Coalbeds, oil sands, and other beds of economic importance commonly are
named, but such units and their names usually are not a part of formal
stratigraphic nomenclature (NACSN, 1983, Art. 26).
d. That portion of an outcrop or face of a quarry that occurs between two
bedding planes. Fay
e. The level surface of rock upon which a curb or crib is laid.
Fay
f. All the coal, partings, and seams that lie between a distinct roof and
floor. Hess
g. Perhaps the most common term in geology, meaning layer or stratum.
Quarrymen usually mean by beds not the stone beds in the geologist's sense
but the partings between them. Arkell
h. A stockpile, as of ore, concentrates, and fluxes, built up of
successive layers so that transverse cutting yields a uniform mixture for
furnace feed until the material is all consumed.
i. In mineral processing, a heavy layer of selected oversized mineral or
metal shot maintained on screen of jig. Pryor, 3
j. That part of conveyor upon which the load or carrying medium rests or
slides while being conveyed.
k. In bulk material conveyors, the mass of material being conveyed.
l. A base for machinery. Nichols, 1
Aust. A mining claim lying on the bed of a stream.
Applied to rocks resulting from consolidated sediments and accordingly
exhibiting planes of separation designated bedding planes. Fay
a. A term usually applied to mineral deposits that are found parallel with
the stratification of sedimentary rocks and usually of contemporaneous
origin. The term is used to describe layerlike deposits of replacement
origin. See also:bedded formation
b. Syn:blanket deposit
A formation that shows successive beds, layers, or strata owing to the
manner in which it was formed. See also:bedded deposit
One of the two subdivisions of competent rock. To be classed as bedded
rock, the rock within each bed, in addition to being elastically perfect,
isotropic, and homogeneous, must have a bed thickness that is small
compared with the roof span, and the bond between beds must be weak. Most
sedimentary rocks and some stratified metamorphic rocks fall in this
group.
a. A quarry term for a structure occurring in granite and other
crystalline rocks that tend to split in well-defined planes more or less
horizontal or parallel to the land surface. Syn:sheeting
Wheeler, R.R.
b. The storing and mixing of different ores in thin layers in order to
blend them more uniformly in reclamation. AGI
c. The layer of heavy and oversized material placed above the screen in
jigging. Also called ragging. Pryor, 4
d. Pieces of soft metal placed under or around a handset diamond as a
cushion or filler. Also called backing; calking. Long
e. Ground or supports in which pipe is laid. Nichols, 1
f. The arrangement of a sedimentary rock in beds or layers of varying
thickness and character; the general physical and structural character or
pattern of the beds and their contacts within a rock mass, such as
cross-bedding and graded bedding; a collective term denoting the existence
of beds. Also, the structure so produced. The term may be applied to the
layered arrangement and structure of an igneous or metamorphic rock.
See also:stratification
AGI
g. The initial filling of a thickener for continuous operation.
Cleavage that is parallel to the bedding. Billings
Formation of layer of valueless and inert rock at points in a new flowline
where material will settle from the stream of ore being treated, for
example, between bottom of thickener and its rakes. Pryor, 3
A fault that is parallel to the bedding. AGI
A term generally restricted to primary foliation parallel to the bedding
of sedimentary rocks; i.e., it forms while the sediment is being deposited
and compacted. It is the result of the parallelism of the platy materials
to the bedding plane, partly because they were deposited that way and
partly because they were rotated into this position during compaction.
AGI
Overthrusting in which a bed, such as a coal seam, is disrupted and thrust
laterally along the roof or floor parting, giving a duplication of coal.
Nelson
a. A thin layer differing in composition with the beds between which it
occurs. Schieferdecker
b. A joint parallel to the bedding planes formed by tectonic processes.
Schieferdecker
a. In sedimentary or stratified rocks, a surface that separates each layer
from those above or below it. It usually records a change in depositional
circumstances by grain size, composition, color, or other features. The
rock may tend to split or break readily along bedding planes.
See also:plane
b. Surface on which rock-forming mineral has been deposited.
Syn:bedding
c. A separation or weakness between two layers of rock caused by changes
during the building up of the rock-forming material.
See also:bed joint
A thrust fault that is parallel to the bedding. Billings
A miner's pick. Pryor, 3
One of the finest and best known building stones to be found in the United
States. It gets its name from its shipping point, Bedford, IN.
Crispin
a. A horizontal crack or fissure in massive rock.
See also:bedding plane
b. One of a set of cracks or fissures parallel with the bedding of a rock.
Webster 3rd
c. A horizontal joint between courses of brick. ARI
d. The horizontal layer of mortar on (or in) which a masonry unit is laid.
ACSG, 1
a. Solid rock exposed at the surface of the Earth or overlain by
unconsolidated material, weathered rock, or soil.
b. In Australia, the stratum upon which the wash dirt rests is usually
called bedrock. It usually consists of granite or boulder clay (glacial)
and, much more rarely, basalt. When the stratum consists of slates or
sandstones (Silurian or Ordovician), it is usually called reef rock.
Eng. Min. J., 1
c. A general term for the rock, usually solid, that underlies soil or
other unconsolidated, superficial material. A British syn. of the
adjectival form is "solid," as in solid geology. See:stonehead
AGI
d. See:bottom rock; rock base.
A borehole drilled to determine the character of bedrock and the character
and depth of overburden overlying such bedrock. Syn:testing bedrock
Long