Steerhead Ranch PowerPoint Presentation, PPT - DocSlides
Purpose. Mapping lower Paleozoic rocks. Mapping syntectonic growth strata. First exposure to mapping faults. General geology. Straddles the boundary between basement uplift and the adjacent Powder River Basin. ID: 555953Direct Link: Embed code:
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Mapping lower Paleozoic rocks
Mapping syntectonic growth strata
First exposure to mapping faultsSlide3
Straddles the boundary between basement uplift and the adjacent Powder River Basin
Hanging-wall anticline thrust over Tertiary basin
Major reverse fault with subsidiary normal and tear faults in the hanging
Clear Creek Thrust ma well have override a land surface and its own
stratigraphyNelson (1968)Use regional values elsewhereSlide7
How do we recognize faults?
contacts or other structural grains
Abrupt changes in strike and dip
Misaligned ridges and valleysSlide8
How do faults terminate
Edge of the map or cross section!
Splaying into several smaller faults
Zone of ductile deformation….here the Gallatin-
Use schematic maps and cross sections to help figure out complicated field
This structure can’t be solved with fewer than seven faults.
Be mindful of the relationship of structure to topography.
Remember your map resolution
You can’t map a fault with only 5’ of offsetSlide14
Map all gravel as Tertiary Wasatch (Tw)
the hanging-wall and
THINK about the Tw thickness and what may be underneath
and Gallatin as a single unit (
). Its attitude may not reflect the big picture structure.
Different units will be in the upper plate along the trace of the Clear Creek Thrust
Both your sections must agree on lower plate stratigraphy and fault geometrySlide15
What you need for tomorrow
All mapping implements
is easy to cover. Don’t do it too quickly or you will miss things. Sit a lot….draw cross sections!
The Hole, Confusion Hill, Coyote Peak
Be prepared for the walk of shame….
The plan for tomorrow