Sedimentary rocks - Geosystems

What are sedimentary rocks made up of?

Sediments (anything that settles out of water).

What are the three types of sediments it could be?

• Fragments of other rock

• Plants/animal remains

• Minerals that precipitate out of solutions

What are the 3 possible formations of sedimentary rocks?

1. Clastic

2. Chemical

3. Organic

How are clastic rocks formed?

From fragments of other rock.

What are clastic rocks categorized by?

Grain size (clay, silt, sand, gravel)

Name 3 clastic rocks

1. Shale

2. Sandstone

3. Conglomerate

Where do chemical rocks precipitate out of?

Solution.

What happens to evaporation in chemical rocks?

It gets left behind.

Name 3 sedimentary chemical rocks

1. Limestone

2. Rock Salt

3. Rock gypsum

Where do organic sedimentary rocks come from?

Plant and animal remains.

Name 3 sedimentary organic rocks

1. Limestone

2. Chalk

3. Bituminous Coal

What is the most common sedimentary rock feature?

Stratification (layers)

What are fossils?

Evidence of living things (trace, imprint, replacement)

What are ripple marks?

Water or wind action in sand preserved in sandstone.

Where can ripple marks be seen?

On bedding plane.

When do mud cracks form?

As mud dries.

Where do mud cracks get preserved in?

Rock