Transcript Louisiana Rocks and Minerals

Louisiana Rocks and
Minerals
An LSU Museum of Natural Science presentation to
accompany the activity
Mining for
MMM…Minerals
Objective: Students will gain an
understanding of where minerals come from
and the environmental impact of mining.
Materials
For teacher: Stop watch, scale, bucket of pennies
For student: 4 chocolate cookies, toothpicks, pencil,
data recording sheet, small weigh boat
Investigating the layercake earth
What is stratigraphy?
Study of sediment layers
and the relationship
between rocks and
fossils with time.
Rules of Stratigraphy
• Steno’s Principle of Superposition
Lower layers are older than higher layers
• Original Horizontality
Layers are deposited in (near-) horizontal
manner
• Principle of Lateral continuity
Layers extend laterally in all direction
• Cross-Cutting Relationships
Layers intruded by other rocks are older than
the
intruding rocks
Sediment layers are Lost…..
Unconformitiesrepresents a gap in
deposition – lost
time!
• Nonconformity
• Angular
• Disconformity
http://epod.usra.edu/archive/images/uncoformitysm.jpg
…..And Moved
Faults - Surfaces where rocks have fractured
and been displaced (move relative to one
another).
Rules apply across Space and Time!
Classroom assessment activity
Deposition 2
Deposition 2
Tilting
Erosion
Tilting
Intrusion
Deposition 1
Deposition 1
Given the diagram, list the order (oldest to youngest) in which
the following
1. Deposition 1
2. Tilting events happened:
3. Erosion
A.
Faulting 2
4. Deposition
C. Erosion
B.
5. Tilting
Intrusion
D. Deposition
E.
6. Intrusion
Faulting
Illustration of example cake set-up. Note different
cake layers (different colors) and fault.