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Sedimentary Rocks (ch5)
Sedimentary rocks. geology for engineers
7
Geology
Undergraduate 4
01/27/2013

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Term
particle sizes
Definition
boulder
cobble
pebble/gravel
sand
Term
organic sedimentary rocks
Definition
coal
chert
limestone
Term
clastic
Definition
conglomerate
breccia
sandstone
shale
Term
shale
Definition
hardened mud (silt and clay)
environment: quiet water, lake, ocean
fissility: splitting into planes
mudstone: breaks into massive chunks
uses: bricks, tiles, cement, pottery
colors:red hematite, black organics
Term
limestone
Definition
tropical oceans
fossiliferous (plas-elas-plas) and micrite (plastic-elastic)
chalk: bodies of foraminifera
karst topography (red flag)
medium strength
Term
evaporites
Definition
precipitated sed rocks
gypsum
halite
borax
potash
rock salt- good storage for peetroleum
red flag- very low strength <8kpsi
elastic-plastic
Term
stratification of sed rocks
Definition
parallel-no changing energy. water deposition under quiet energy
cross-strat.- strata uneven from variable energy and directions
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