Stratigraphy and Bedding
The outcrop visible at clay point consists of alternating beds of sandstone and mudstone
The beds are of varying thickness and spacing
Measurements were taken of bedding planes, cleavage, and intersection lineations
Should I mention axial planar cleavage
A base map was created from this data
The base map contains sandstone layers of mapable size
The location of measurement stations are marked by the symbols
Describe orientation of features
Implied structures determined by fold axis observations and measurements
Measured Fold axis 045 19 NE determined by observed hinge zones
Fold structures are disrupted by the fault in the South West
South Wall Cross-section
This diagram shows the structures present on the south wall and the domains used to map
and analyze them.
The domain analysis was based on separating the faulted zones where cleavage was
visibly different from the rest of the outcrop
Vergence and facing were determined in several places on the south wall
Should I mention axial planar cleavage
Fault Formation
Two types of faults were visible in several places across the outcrop
Bedding parallel faults-folded
Un folded faults which cut across bedding and folded structures
Stereonet Plots
Major plot of all non-wedge data
Shows a clear trend of bedding across the outcrop
The pole of bedding great circle, the cleavage great circle, and the vector of intersection
lineations all intersect to show the calculated fold axis
The data collected from the western syncline shows a similar pattern with a different fold
axis
The difference in cleavage from inside and out of the wedge used to calculate strain
Data Analysis
Measured fold axis – 045 19NE
Calculated – 057 16NE
Western syncline 038 21NE
Strain = .176
% shortening
Stratigraphy controlling structure
Cleavage found in mudstone
Forms from dissolution of calcite-less in sandstone
Forms because of compression
Folding and faulting also form
Faults along bedding boundary indicate a zone of weakness
Structure
Cleavage – consists of dissolved out material leaving behind soft clay and silts - similar
orientations across outcrop – axial planar cleavage
Evidence of rotation within the wedge
Faults – Show evidence of movement: slickenlines, calcite deposits, truncate other
structures
Relative age determined by cross cutting and folding