CLAY POINT
Rolfe Stanley
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Dress warmly with layers of clothes. Clay Point is located on the shore
of outer Mallets' Bay
<bold><fontfamily><param>Charcoal</param>CLAY POINT BEDROCK GUIDE
Purpose: </fontfamily></bold><fontfamily><param>Charcoal</param>To
understand the evolution of a deformed structure.
<bold>Methods: </bold>Geologic map and cross section (s), equal area
analyses of structural measurements.
<bold>THE DATA
Bedrock Ma</bold>p
Bedrock Map
Clarity and Accuracy of contacts
Key Beds
Structural Symbols representing cleavage, fold axis, axial trace,
faults, slickenline orientations, dikes.
Station Location for data. This info can be on a separate copy of
your map if your main geologic map is too cluttered
Line of Section(s) (south face definitely , north face possibly)
Cross Section (south-facing wall, and possible the north-facing wall)
( make the diagram as accurate as possible, careful sketch, enlarged
photographs)
Beds
Faults (old)
Faults (young)
Movement Arrows
"Topping Directions" for stratigraphy
Equal Area Nets (data abundance, accuracy, calc. orientations,labels,
figure captions,north arrow)
Bedding
Cleavage
Intersection lineations (calc)
Intersection lineations (observe)
Fold Axes (from bedding)
Faults and slickenlines
Domain Analysis
2 domains east of fault zone, make sure they are east of fault where
the cleavage changes its orientation on the south face.
1 domain west of main fault zone
Synoptic equal area diagrams. These diagrams summarize the structure
for the whole outcrop
<bold>THE REPORT (This will be either a poster session or a PowerPoint
presentation. In either approach you will be required to prepare
written material. The following outline highlights important topics to
consider).
</bold>A. Abstract (<< 300 words)
1. Does it describe the key findings of the study?
B. Introduction
1. Does it describe the location and the purpose of the report ?
C. Stratigraphy
1. <underline>Data</underline>. Are the rock sequence and the key
features described adequately?
2. <underline>Interpretation.</underline>
D. Structure
1.<underline> Data. Make use of your maps and cross
sections.</underline>
a. Bedding. How it is recognized and how it changes across the
outcrop.
Show equal area nets of bedding for area east of major fault (s) and
west of the major fault (s). By fault I mean the ones that you
mapped on the western part of the outcrop.
b.Cleavage. Its characteristics and orientation as shown in equal
area nets. Plots for area east of faults and west of faults. Does
it change ? Significance?
c. Intersection lineations. How are they formed and how well do the
calculated intersections agree with the intersections measured in
the field?
d. Faults. Their characteristics and relative age.
Questions to consider in your discussion of structures and their
analysis using equal area nets.
1. Do the fold axes change across the outcrop or are they constant
(trend and plunge)?
2. How accurate is the fold axes calculations?
3. To what extent are the younger faults control the change in
orientation of the fold axes?
4. Error analysis? (comparison among different equal area nets)
2. <underline>Structural evolution of the outcrop</underline>.
<bold>(RETRODEFORMATION) IMPORTANT. Use the south facing wall as the
stating point for retrodeformation
</bold>E. References Cited
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Rolfe Stanley
Stanley Computer Center
Fletcher Extension
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