SEDIMENTARY ROCKS
HOW DO THEY FORM:
- Form from pieces of other rock (sediments)
that are compacted and cemented together.
- The sediments are deposited in horizontal
layers, at the bottom of a lake or ocean and
usually carried by an agent of erosion.
- These particles start off irregularly shaped but
usually end up nice and rounded or filed down
because of their long journey (Wind Water
Glacier)
The process of weathering breaks them down,
EROISION carries them away
Sedimentary are the most common on the Earths
surface there is a thin layer over Metamorphic and
Igneous rocks
According to your reference tables Sedimentary
rocks are broken down into 3 types 2 don’t fit the
bill
1. Clastic: (fragmental) rocks are formed by
compaction and cementation of sediments.
Shale sandstone, conglomerate. Fossils
2. Bioclastic: Once living things Coal and
Limestone
3. Crystaline: Evaporation of seawater,
gypsum or rock salt. This may indicate the
area was once covered by an ocean
Fossils are found here
Ripple Marks
Name the Rock:
I Contains Quartz, feldspar and some clay
I also contain fragments of other rocks and
minerals
My texture is from fine to coarse
And my grain size is 0.1
Who am I?
Name the Rock
I contain pieces of cemented cell fragments.
If you pour acid on me it will burn and sizzle (but
please don’t because it hurts)
Who am I?
Name the rock:
I was created when a large but shallow sea
evaporated away and left minerals such as halite
on the bottom to clump together to form me
Who am I?
Which observation about the rock best supports this classification?
1. The rock is composed of several minerals.
2. The rock has a vesicular texture.
3. The rock contains fragments of other rocks.
4. The rock shows distorted and stretched pebbles.
1.Name the rock that is most likely to form at Zone D
The diagrams represent four rock samples. Which
rock took the longest time to solidify from magma
deep within the Earth?
1.
3.
2.
4.
Which rock unit was most likely formed from chemical
precipitates?
1. Lockport dolostone
2. Whirlpool sandstone
3. Rochester shale
4. Thorold sandstone
In which rock unit would unsorted rock fragments of
greatly varying size most likely be found?
1.A
2.E
3.G
4.H
Which event would most likely convert the sediments in
layer 5 into rock?
1. cementation of sediments caused by chemical processes
2. recrystallization due to heat from the intrusion of layer 3
3. rapid cooling from the contact with the ocean
4. heating and drying out due to rising convection currents.
In which location is a geologist most likely to find rock
composed of intergrown crystals?
1. A
2. B
3. C
4. D
The rock at B most likely contains
1. quartz, only
2. quartz and potassium feldspar (orthoclase), only
3. potassium feldspar (orthoclase), pyroxene, and olivine
4. plagioclase feldspar, pyroxene, and olivine
Which rock is most likely organic in origin?
1. limestone
2. sandstone
3. basalt
4. conglomerate
What do each of these areas of mineral deposits have in
common?
1.They are active fault zones of Earth’s crust.
2.They were once covered by evaporating seas.
3.They presently have hot, dry climates.
4.They are sites of active volcanoes
Which sample is composed mostly of clay-sized particles?
Which granite sample most likely formed from magma that cooled and solidified at the slowest rate?
1.
2.
3.
4.
Which type of sedimentary rock was formed at layer X?
Rock B is most likely which type of igneous rock?
1.granite
2.peridotite
3.pegmatite
4.basalt
Which characteristic provides the best evidence that
this pegmatite solidified deep underground?
In which set are the rock drawings labeled with
their correct rock types?
1.
2.
3.
4.