Table of ContentsTitle: Types of Sedimentary

RocksPage #: 42

Date: 12/3/2012

Objective Students will be able to describe

the three types of sedimentary rocks.

Word of the Day Reservoir: Any place in which

water, liquid gas, or oil may be stored.

Types of Sedimentary Rocks

Clastic: Formed from loose sediments on Earth’s surface.

3 Categories:1. Coarse Grained: Gravel sized grain.

• Conglomerate - gravel sized, well rounded grains. Formed by fast flowing water.

• Breccia - large angular grains, particles. Not transported very far.

Conglomerate Breccia

Types of Sedimentary Rocks

Clastic: Formed from loose sediments on Earth’s surface.

3 Categories:2. Medium Grained: Sand sized grains.

• Example: Sandstone.• High porosity - lots of spaces between grains.

• Means rock may hold water, gas, oil - it’s a reservoir!

Sandstone - medium sized grains

Types of Sedimentary Rocks

Clastic: Formed from loose sediments on Earth’s surface.

3 Categories:3. Fine Grained - Silt and clay sized

particles.• Example: Shale - low porosity. Formed by

swaps and ponds - low currents = horizontal layering.

Limestone - fine grained

Types of Sedimentary Rocks

Chemical Sedimentary Rocks: Evaporites - formed when dissolved minerals precipitate out of solution.

Example: Salts

Rock Salt

Types of Sedimentary Rocks

Biochemical Sedimentary Rocks: Made from remains of animals.

Water animals use calcite for shells and die leaving remains.

Example: Calcium Carbonate = Limestone.

Classwork Is it sedimentary or Igneous?