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Unformatted text preview: single sedimentary layer, inclined at an angle
to the main planes of bedding in a body of rock or unconsolidated deposit.
deglaciation - The uncovering of a land area from beneath a glacier or ice sheet
by the withdrawal of ice due
to shrinkage by melting and
density current - A gravity-induced flow of one or more
currents of varying densities
over, through, or under another current.
dip - The angle that a structur41 al surface, that is, a bedding
or fault plane, makes with a
dolomite - A carbonate sedimentary rock of which more
than 50 percent consists of
calcium magnesium carbonate.
end moraine - A ridge-like accumulation of glacial drift
formed at the margin of an
actively flowing glacier.
formation - A body of rock identified by color, mineralogic
composition, grain size and
stratigraphic position that is
mappable or traceable.
freeze and thaw - The mechanical weathering of rock caused
by repeated cycles of freezing
and thawing of water in pores,
cracks, and other openings,
usually at the surface.
gneiss - A coarse-grained, foliated metamorphic rock
marked by bands of light-colored minerals such as quartz
and feldspar that alternate
with bands of dark-colored
g ranite - A light-colored,
igneous rock composed of
quartz, feldspar, and mica.
Holocene - An epoch of Quaternary period ; 10,000 years
ago to present time.
knob-and-kettle topography - An
irregular landscape in which
an assemblage of knolls,
mounds, or ridges of glacial
drift is interspersed with irregular depressions, pits, or
kettles that are commonly undrained and may contain
swamps or ponds.
Laurentide ice sheet - Pleistocene ice sheet that covered most of northern North
America east of the Rocky
limestone - A sedimentary rock
consisting chiefly of calcium
carbonate, primarily in the
form of the mineral calcite.
mass wasting - A general term
for the dislodgement and
downslope transport of soil
and rock materials.
mastodon - One of a group of...
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