1. Unit 2: Rocks and Minerals
2-6 Sedimentary Rocks
Unit 2: Rocks and Minerals
October 24, 2011
Sanders

2. Vocabulary Clastic: Non-clastics:
sedimentary rocks made up of pieces of rock
Non-clastics:
sedimentary rocks made up of dissolved minerals, or the remains of living things

3. Vocabulary Chemical rock: Organic:
chemical rock is rock make of minerals that were once dissolved in water.
Organic:
organic rock is rock made up of substances that were once part of or made up of living things

5. Sedimentary Classification
Sedimentary rocks are classified according to their manner of origin of formation
Clastic
Chemical
Organic

6. Sedimentary Rock
Nearly 75% of the top 15 km of the earth's crust is made of sedimentary rock.
However, sedimentary rock constitutes nearly 75% of the exposed rock on the earth's surface.

7. Beds
Sedimentary rocks often consist of thin flat sheets, called beds.

8. Formation
These beds form when sedimentary deposits are buried, compressed, and cemented together.

9. Clasic
Sedimentary rock, such as this sandstone, forms when layers of sediment are compacted and cemented together.

10. Chemical Rocks
Sedimentary rock can also form when a solution containing dissolved minerals evaporates and leaves behind mineral deposits.
The “White Cliffs of Dover” are made of
deposited seashells.

11. Deposited Materials
Sedimentary Rock is rock formed by the deposits of mineral and particles left behind by of water or, wind or glacial Ice.