PowerPoint sed rocks

Sedimentary Rocks


Sedimentary Rocks
Sedimentary rocks form in 1 of 3 ways:
1. Clastic Sedimentary Rocks- made of pieces and grains of other rocks. Material
such as sand or mud
-usually deposited in water

Conglomerate

sandstone


Sedimentary Rocks
2. Chemical Sedimentary Rocks- deposited in water
from chemicals and minerals in the water.
-limestone is deposited in water from calcite


Sedimentary Rocks
• 3. Organic sedimentary rocks- made up of remains of
plants or animals.
– Chalk is made from tiny shells
– Coal is made from ancient plants


Other sedimentary Features

1. Fossils- can be very common in sedimentary rocks

2. Nodules- (concretions) are ball-shaped rocks formed
around a hard center object such as a sand grain
3. Geodes- hollowed out nodules with crystals filling the
center area. Crystals are usually quartz



Rock Name
1. Sandstone

Sedimentary Rocks

Formation
clastic

Composition Other Features/Color
sand grains

rust color(iron)


Rock Name
2. Shale

Sedimentary Rocks

Formation
clastic

Composition Other Features/Color
mud

“mud stone”, layers


Sedimentary Rocks
Rock Name Formation Composition Other features/color
3. Conglomerate clastic rocks,cements

natural cement


Sedimentary Rocks
Rock Name Formation Composition Other features/color

4. Coal

organic

ancient plants

black, carbon


Sedimentary Rocks
Rock name formation
5. Limestone chemical

composition other features/color

calcite

caves


Sedimentary Rocks
Rock name formation

6. Nodule

clastic

composition other features/color

sand grains

desert rose


Sedimentary Rocks
Rock name formation

7. Geode

clastic

composition other features/color

quartz crystals

hollow “earth stone”


Sedimentary rocks
Rock name formation composition other features/color
8. Agate

clastic

quartz

“melted quartz”


Sedimentary Rocks
Rock Type

formation

9. Jasper

clastic

composition other features/color

quartz reddish brown

“Jasper”

Sedimentary Rocks
Rock Type

formation

10. Chert clastic

composition other features/color

quartz

brown, arrowheads


Quiz: Sedimentary Rocks
What you should know

- You should be able to identify the 10 sedimentary rocks

- You should know which are clastic, chemical, and organic
- You should know how clastic, chemical, and organic rocks form
- What is a nodule? A fossil? A desert rose? A geode?
- What is the mineral usually inside geodes?
- What are the 3 agates we learned?
- What was my dog’s name? Why?
- What mineral is limestone made of? What mineral are quartz, jasper, and
chert made of?
- What is sandstone made of? What is shale made of?
- What rock is also called earthstone? Which is also called mudstone?

- You MUST pass quiz to be able to the next 2 labs in class


On back of quiz paper
What are the 3 kinds of sedimentary rocks?
18. __________________
19. __________________
20. __________________