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Sedimentary Rocks
Earth Systems
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When do sedimentary rocks form?
When do sedimentary rocks form?
• Sedimentary rocks start to form when
fragments of existing rocks get broken down
into sediments.
Some More Stuff to Know
Some More Stuff to Know
• There are four major processes of forming
sedimentary rocks
Some More Stuff to Know
• There are four major processes of forming
sedimentary rocks
• Weathering, Erosion, Deposition, and
Compaction/Cementation.
Some More Stuff to Know
• There are four major processes of forming
sedimentary rocks
• Weathering, Erosion, Deposition, and
Compaction/Cementation.
• In that order of course.
Weathering
Weathering
• Weathering is breaking down rock using
agents of erosion.
Weathering
• Weathering is breaking down rock using
agents of erosion.
• Water, ice, wind or gravity. These are agents of
erosion.
Weathering
• Weathering is breaking down rock using
agents of erosion.
• Water, ice, wind or gravity. These are agents of
erosion.
• Chemical weathering is when rocks get
dissolved into new substances.
Erosion
Erosion
• Erosion is the weathering of rock to break the
rock down into sediments.
Deposition
Deposition
• Deposition is when sediments fall out of the
agent of erosion they are currently in
Forms of Forming Sedimentary Rocks
Forms of Forming Sedimentary Rocks
• Compaction is a process the squeezes
sediments together forming rocks
Forms of Forming Sedimentary Rocks
• Compaction is a process the squeezes
sediments together forming rocks
• Cementation is when dissolved particles in
deposited in tiny spaces in sediments
Types of Sedimentary Rocks
Types of Sedimentary Rocks
• There are two types of sedimentary rocks
Types of Sedimentary Rocks
• There are two types of sedimentary rocks
• Clastic and Chemical/Biochemical
Types of Sedimentary Rocks
• There are two types of sedimentary rocks
• Clastic and Chemical/Biochemical
• They are classified by what they are made of
Clastic Rocks
Clastic Rocks
• Clastic rocks are made of weathered bit of
rock
Chemical/Biochemical Rocks
Chemical/Biochemical Rocks
• Chemical rocks are made from dissolved
particles that separate from water (normally
after evaporation).
Chemical/Biochemical Rocks
• Chemical rocks are made from dissolved
particles that separate from water (normally
after evaporation).
• Limestone is a very common chemical rock,
and so is chalk
Chemical/Biochemical Rocks
• Chemical rocks are made from dissolved
particles that separate from water (normally
after evaporation).
• Limestone is a very common chemical rock,
and so is chalk
• 90% of limestones from biochemical
sediments
Why do we care?
Why do we care?
• No seriously, why do we care?
Fossils and Earth Aging
Fossils and Earth Aging
• Shapes in the rocks show the kinds of
environments these rocks formed in.
Fossils and Earth Aging
• Shapes in the rocks show the kinds of
environments these rocks formed in.
• Fossils and the layers in these rocks help
determine how old the rocks are and when
they were formed.