Soils - Sedimentary Parent Material

Theprecipitakonofcalciteoccursdueto

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Unformatted text preview: S
 •  Water
produces
well
sorted
material
 ARRANGEMENT
OF
GRAINS
 •  Wind
produces
well
sorted
material
 ComposiAon
of
cement
 •  Also
important
for
properKes
of
the
rock

 CLASSIFICATION
OF
DETRITAL
ROCKS
 •  Based
primarily
on
the
size
of
the
parKcles
 SHALE
 •  Finest
grains
 SHALE
 •  more
than
50%
of
all
sedimentary
rocks.
 •  includes
shale,
siltstone,
mudstone,
claystone,

 SHALE
 •  the
finest
parKcles
 –  GRAIN
SIZE
1/256
of
an
inch
 •  Less
than
0.074
mm
 –  GRAIN
SHAPE
‐
not
important
 •  Cannot
see
individual
grains
by
the
naked
eye
 SHALE
 •  COMPOSITION
(color)
reflects
ENVIRONMENT
 –  red

 –  green

 –  black

 RED
SHALE
 Arid
‐
dry
 High
 Oxygen
 Iron
 oxides
 GREEN
SHALE
 SomeKmes
volcanic.


Normal
oxygen
 BLACK
SHALE
 Stagnant
‐
low
oxygen
environment
 swamps
 SANDSTONES
 •  25%
of
all
sedimentary
rocks

 –  (three
main
types)
 –  GRAIN
SIZE
 –  GRAIN
SHAPE
 •  ‐
not
important
for
classificaKon
 –  COMPOSITION
 Sandstones
 •  Sand
sized
grains
 •  Think
beach
sand
 •  0.5‐2mm
 SANDSTONES
 •  GRAIN
SHAPE
 –  Can
be
rounded
or...
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This note was uploaded on 01/23/2012 for the course GEOL 306 taught by Professor Staff during the Spring '08 term at George Mason.

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