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Geology 1023

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Geology 1023. Correlations. Correlations. Outcrop is not continuous ... Use the photo to 'walk out' the outcrop. Determine the type of fold ... – PowerPoint PPT presentation

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Title: Geology 1023


1
Geology 1023
  • Correlations

2
Correlations
  • Outcrop is not continuous
  • We need to be able to compare and contrast rocks
    at different locations i.e., correlate
  • Various approaches but all involved identifying
    and recording the rocks and their structures at
    each locality

3
Contacts
  • Conformable
  • abrupt
  • gradational
  • Unconformable
  • angular unconformity
  • non-conformity
  • disconformity

4
Stratigraphic column
  • Record of rocks present at any given location
  • Rectangular column with unit thickness shown by
    proportional division and composition shown by
    patterns

5
Simulated column
  • Rocks at back of lab
  • Given thicknesses and lithologies
  • Write out some descriptions
  • Make a column

6
Add scale, using an arbitrary zero point.
7
First unit is 2 m of shale (2 columns wide)
8
Next unit is 2 m of sandy siltstone (2.5 columns
wide)
9
Next unit is 10 m of conglomerate (4 columns wide)
10
and so on!
Once column is complete, subdivide into
formations.
11
Physical correlation
  • Use the photo to walk out the outcrop
  • Determine the type of fold
  • Correlate different positions
  • Determine the ages

12
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13
Correlations
  • Once columns are prepared then the geology at
    each location can be compared and correlated.

14
?
15
Geophysical properties
  • One can correlate using geophysical properties
  • Fig. 8 (p. 11) shows a real case

16
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19
And so on...
But whats going on here?
20
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21
Questions?
22
Reminder!Lab test next week!
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