AIM: How do Scientists correlate rock layers? - PowerPoint PPT Presentation

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AIM: How do Scientists correlate rock layers?

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AIM: How do Scientists correlate rock layers? Do Now: - Using your ESRT list the time periods of the 4 rock layers below from oldest to youngest. – PowerPoint PPT presentation

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Title: AIM: How do Scientists correlate rock layers?


1
AIM How do Scientists correlate rock layers? Do
Now - Using your ESRT list the time periods of
the 4 rock layers below from oldest to youngest.
Devonian Silurian Ordovician Cambrian
2
I. Correlation To match rock layers from
different outcrops based on rock composition,
fossils and other distinguishing traits.
Which two layers will correlate together?
B and D or C and F
3
II. Using outcrops Outcrops - series of rock
layers taken from specific places on earth.
4
  • - Looking at fossils and types of rocks scientist
    match layers within outcrops. Other features such
    as unconformities and intrusions are used to help
    match layers as well.
  • When correlating rock outcrops you should redraw
    the layers and place them next to one another in
    order.

5
III. Fossils? - Trace remains of ancient life
found only in sedimentary rocks. - when a
fossils forms, the organism must have hard parts(
shells or bones) and the organism needs to be
buried quickly.
6
Index Fossils
- special fossils that correlate to a specific
time period.
Looking back in your notes, what are the three
criteria a fossil needs in order to be considered
an index fossil?
- Widespread geographically (found on all
continents, in all outcrops) - Found in only one
layer (one layer one time period) - Easily
identifiable (you do not need to look it up)
7
  • Types of fossils
  • Impressions when an organism is pressed into
    soft sediment and the imprint is preserved during
    lithification.
  • Amber when an organism is trapped in tree sap
    that solidifies trapping the organism inside.
    (Jurassic Park)
  • Petrified wood when minerals replaces the empty
    spaces within and organism harden preserving the
    shape and look.
  • Casts when organisms are buried entirely and
    create a void in the rock with the impressions of
    the organism.

DO NOT COPY
8
Closure From the back, take correlation sheet A
and we will practice correlating together. After,
you will take Correlation sheet B and try this
skill yourself. Correlation sheet C is extra
credit worth 3 on your next quiz.
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