A machine for making bricks of peat fuel. Standard, 2
A spade with an L-shaped blade for cutting out peat in blocks.
Webster 3rd
The theory that there were progressive stages in the conversion of
vegetable matter into the various grades of coal of the Carboniferous
system. Thus, peat forms at an early stage in coal formation and lignite
at an intermediate stage, and by further compression and alteration,
bituminous and anthracite coals were formed. See also:Hilt's law
Nelson
a. A general term for a small, roundish, esp. waterworn stone; specif. a
rock fragment larger than a granule and smaller than a cobble, having a
diameter in the range of 4 to 64 mm (-2 to -6 phi units, or a size between
that of a small pea and that of a tennis ball), being somewhat rounded or
otherwise modified by abrasion in the course of transport. In Great
Britain, the range of 10 to 50 mm has been used. The term has been used to
include fragments of cobble size; it is frequently used in the plural as a
syn. of "gravel". Syn:pebblestone
b. Transparent and colorless quartz crystal, such as Brazilian pebble.
Webster 3rd
c. Grinding media for ball or semi-autogeneous mills. As a rule, these are
either hard-flint pebbles or hard-burned, white porcelain balls.
A concentration of pebbles coating a desert area. The pebbles are usually
the residual product of wind erosion and are closely fitted together so as
to cover the surface in the manner of a mosaic. Also called desert
pavement. See also:lag gravel
a. A clastic dike composed largely of pebbles. AGI
b. A tabular body containing sedimentary fragments in an igneous matrix,
as from the Tintic district in Utah; e.g., one whose fragments were broken
from underlying rocks by gaseous or aqueous fluids of magmatic origin and
injected upward into country rock, becoming rounded owing to the milling
and/or corrosive action of the hydrothermal fluids. AGI
An unconsolidated deposit consisting mainly of pebbles. AGI
Sphalerite in small crystals or pebblelike grains not attached to rock,
but found in clay in wall rock cavities.
Horizontally mounted cylindrical mill, charged with flints or selected
lumps of ore or rock. Usually long and high discharge.
See also:ball mill
A secondary phosphorite of either residual or transported origin,
consisting of pellets, pebbles, and nodules of phosphatic material mixed
with sand and clay, such as occurs in Florida; e.g., land-pebble phosphate
and river-pebble phosphate. See also:phosphorite
A gunpowder or black powder pressed and cut into large cubical grains so
as to make it slow burning. Webster 3rd
See:pebble
A fernlike tree of the coal forest, with small ovate pinnules that are
attached to the pinnate axis by their whole breadth. Nelson
a. A gossan containing lead and silver. Fay
b. Tasmania. A yellowish, earthy mixture of oxides of iron, lead, and
antimony containing silver; mostly massicot. Fay
A triclinic mineral, NaCa2 Si3 O8 (OH) ; isomorphous
with serandite; forms compact masses or fibers; commonly associated with
zeolites in cavities and veins in mafic rocks.
Soil enriched in alumina and iron in regions of high temperature and humid
climate that are marked by forest cover. CF:pedocal
A relatively slender neck or column of rock capped by a wider mass of rock
and produced by undercutting as a result of wind abrasion (as in the
Southwestern United States.) or by differential weathering.
See also:pedestal rock
a. A class of blocks perched on pedestals of limestone. AGI
b. Isolated masses or rock above and resting on a smaller base or
pedestal.
An isolated, residual or erosional mass of rock supported by or balanced
on a pedestal. The term is also applied to the entire feature.
See also:pedestal boulder
A small dumper controlled by a person walking alongside it.
Syn:power barrow
A broad, gently sloping rock-floored erosion surface or plain of low
relief, typically developed by running water in an arid or semiarid region
at the base of an abrupt and receding mountain front or plateau
escarpment; underlain by bedrock that may be bare, but is more often
partly mantled with a thin discontinuous veneer of alluvium derived from
the upland masses and in transit across the surface. AGI