Sedimentary Rocks and Processes

What type of sedimentary rock is described: Made of mud, high fossilization potential, fine texture.

• Sandstone

• Shale

• Limestone

• Coquina

What type of sedimentary rock is described: Made of rounded inclusions of a wide variety of rocks, coarse texture, not well sorted

• Breccia

• Conglomerate

• Limestone

• Sandstone

What type of sedimentary rock is described: Made of intergrown calcite minerals, effervesces vigorously in weak acid (HCl), may have fossils

• Sandstone

• Shale

• Limestone

• Coquina

When sediments are pressed together tightly, this is called ____________.

• Compaction
• Cementation
• Weathering
• Erosion

This rock was formed by smaller pieces of rock that settled at the bottom of a lake millions of years ago. What type of rock is this?

• Sedimentary
• Igneous
• Metamorphic

Sandstone is deposited in layers of sand (beaches and/or deserts). The picture shows obvious:

• Horizontal bedding planes

• Large crystals

• Fossils in the layers

• Intergrown crystals

What describes the rock pictured?

(*Note: Obvious shells)

• Breccia

• Conglomerate

• Limestone

• Coquina

This rock is made from tiny pieces of other rocks that settled to the bottom of a valley millions of years ago. What type of rock is this?

• Chemical Sedimentary

• Detrital Sedimentary

• Foliated Metamorphic

• Igneous Intrusive

The process of abrasion does WHAT to rock trapped in moving water as it flows downhill and downstream?

• Rounds the fragments as a chemical process

• Rounds the fragments as a mechanical/physical process

• Makes the particles more angular (jagged) over time

This rock was formed by rounded pieces of rock that were deposited from moving water. Why are the inclusions rounded?

• Chemical weathering - a net change in the composition of the rock

• Chemical processes such as precipitating of minerals

• Abrasion - mechanical/physical weathering