Download What are Sedimentary Rocks?

MOST SEDIMENTARY ROCKS
FORM IN
Rock Color
• The color of a sedimentary rock will be
determined by the cementing material and
sediment composition
• Red Sandstone – means the rock has iron in
it that has been exposed to air (rusting).
Stratification-layers of sediments
deposits over extended periods of
time
Sedimentary Veneer
• Even though most of the crust is
composed of Igneous rock the Earth’s
surface is covered by a veneer (thin
layer) of sedimentary rocks.
• Sedimentary rocks form a veneer on the
earths surface because as igneous rocks
are uplifted to the surface and exposed to
air and water they are weathered and
broken into sediments that become
cemented and compacted into
sedimentary rocks.
Veneer of Sedimentary Rocks
How are Sedimentary Rocks Formed?
Sediments become buried, compacted, and
cemented together to create a rock.
sedimentary formation
sedimentary formation 2
Sedimentary Rocks are Classified into
3 separate categories based on how
they formed
• Clastic
• Chemical / Crystalline
• Bioclastic / Organic
Clastic – fragmental sedimentary rocks
• Sorted and classified by Grain size.
• Conglomerate – the clastic rock that has the
widest range of grain sizes (pebbles to clay)
Reference Table and clastic rock pics
Chemical Rocks
• Have compacted crystals (not intergrown,
this would be igneous)
• MONOMINERALIC – made of ONE mineral
• Chemical rocks and the esrt and pics
Bioclastic / Organic- Made
from the remains of living
material
• organic rocks and ESRT
•Limestone: Shells
•Coal: plant remains
Sediments- fragments of rock particles
SILT
PEBBLES
SAND
CLAY