Steerhead Ranch PowerPoint Presentation, PPT - DocSlides

Steerhead Ranch PowerPoint Presentation, PPT - DocSlides

2017-06-05 33K 33 0 0

Description

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: 555953

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Presentations text content in Steerhead Ranch

Slide1

Steerhead Ranch

Slide2

Purpose

Mapping lower Paleozoic rocks

Mapping syntectonic growth strata

First exposure to mapping faults

Slide3

General geology

Straddles the boundary between basement uplift and the adjacent Powder River Basin

Hanging-wall anticline thrust over Tertiary basin

fill strata.

Major reverse fault with subsidiary normal and tear faults in the hanging

wall.

Clear Creek Thrust ma well have override a land surface and its own

syntectonic

growth strata.

Slide4

Slide5

Slide6

Local

stratigraphyNelson (1968)Use regional values elsewhere

Slide7

How do we recognize faults?

Stratigraphic duplication

Stratigraphic omission

Truncation of

contacts or other structural grains

Abrupt changes in strike and dip

Fault rocks

Breccia

Gouge

Streams

may

follow

faults

Misaligned ridges and valleys

Slide8

Extensional faults

Slide9

Tear faults

Slide10

Splay faults

Slide11

Composite structure

Slide12

How do faults terminate

Edge of the map or cross section!

Another fault

Splaying into several smaller faults

Zone of ductile deformation….here the Gallatin-

Gros

Ventre

Slide13

Helpful hints

Look for

evidence

of

faults. Don’t

imagine them

Use schematic maps and cross sections to help figure out complicated field

relations

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 offset

Slide14

Mapping/Section guidelines

Map all gravel as Tertiary Wasatch (Tw)

Remember it

is in

the hanging-wall and

footwall

THINK about the Tw thickness and what may be underneath

Map the

Gros

Ventre

and Gallatin as a single unit (

Cgg

). 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 geometry

Slide15

What you need for tomorrow

Positive

attitude

Positive attitude

All

field gear

All mapping implements

Liability waiver

Patience….

this area

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….

Slide16

The plan for tomorrow


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