Download 3.3 Sedimentary Rocks

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AIM: How are Sedimentary Rocks
Formed?
Do Now: Take out your ESRT and turn to page 7.
Look at the chart called Scheme for Sedimentary
Rock identification and answer the questions
below.
1) What textures of Sedimentary rocks will we be
working with?
2) What material (not composition) are Clastic
rocks made from?
I. Formation of Sedimentary Rocks
- mostly made from sediments (small pieces
of other rocks).
- as well as once living things and
precipitates.
Bioclastic Limestone
Rock salt
Conglomerate
II. How are Sedimentary rocks made?
What materials do you need to make most Sedimentary
Rocks?
• Weathering - breaking down of rocks into
small pieces (sediment)
• Erosion
- transportation of sediment
by water, wind or ice
(agents of erosion).
• Deposition - When the sediment stops
moving because the agent
of erosion stops.
• Compaction and Cementation (Lithification)
– squeezes (from material on top) and glues
(minerals) sediments together forming a rock.
Sediments
are
lithified into
clastic
sedimentary
rock
III. Classification of Sedimentary Rocks
A. Clastic (fragmental) – composed of small
peices of rocks.
- Categorized by particle (grain) size.
Siltstone (silt)
Sandstone (sand)
Conglomerate and Breccia (Pebbles)
Shale (clay)
B. Crystalline (Chemical precipitates)–
- water evaporates and leaves material
behind to form rocks (like minerals).
- rocks have a milky or crystalline
appearance
Limestone
Rock salt
C. Bioclastic
- composed of once living things (plants and
shells).
Limestone
Limestone
Bituminous Coal
IV. Features of Sedimentary Rocks
1. Layers – continuous depositions of
sediments causes a layering effect. (like
sand art)
2. Fossils – imprints of ancient life.
Closure:
- Take out your Review Books and work on pages
62-63 # 1-10
1. 3 2. 4 3. 2 4. 4 5. 2 6. 4 7. 4 8. 2 9. 4 10. 4
Take Sedimentary Rock packet from the back
Homework bin. Set I is your homework.
Also, take a blue Sedimentary Rock Lab from the
top do now bin and work on the pre-lab
discussion questions.
Take a black cup of rocks from the back of the
room