1. Sedimentary Rocks
Chapter 3-3

2. Sedimentary Rocks 3.3 What are the three types of Sedimentary Rocks?
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Sedimentary Rocks 3.3
What are the three types of Sedimentary Rocks?
Chemical
Formed from minerals that were dissolved in water
Water evaporates leaving behind minerals that form rocks named evaporites
Examples: Gypsum (the stuff that drywall is made of) and Halite (rock salt)

3. Sedimentary Rocks 3.3 Organic
NBpg. 38
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Sedimentary Rocks 3.3
Organic: Rocks made from the remains of living things
Coal forms when plants are buried before they decay and are then compacted into a solid made mostly of carbon
Limestone forms from the shells of marine organisms like coral, clams oysters and plankton.
Organic

4. Sedimentary Rocks 3.3 Clastic
NBpg. 38
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Sedimentary Rocks 3.3
Made from different types of rock fragments that are joined together by,
Compaction: sediment is squeezed by the layers above so the space between the rock fragments is reduced
Cementation: minerals seep into the spaces between the rock fragments and glue these fragments together
Clastic
sedimentary rock

5. NBpg. 38
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Sedimentary Rocks 3.3
Determined by the way the sediment is transported (water, ice, wind, and gravity)
Speed of travel affects the size of sediment that can be moved
Distance affects how much happens to the sediment along the way
More collisions cause the particles to become more rounded
Angularity a measurement of how rounded a particle is.
Characteristics of Clastic Sediments

6. Types of Clastic Sedimentary Rock Classified by the size and shape of the sediment they contain
Rock Name
Size
Sediment Name
Shape
Conglomerate
Course (over 2 mm)
Gravel
Rounded fragments
Sandstone
Medium (1/16 to 2 mm)
Sand
Sand sized fragments
Shale
Very fine less than (1/256 mm)
Mud
Clay-sized particles
Breccia
Coarse (over 2 mm)
Angular fragments

7. Types of Clastic Sedimentary Rock Classified by the size and shape of the sediment they contain
Conglomerate (rounded fragments)
Sandstone (sand sized- fragments
Breccia (angular fragments)
Shale (clay-sized particles)