Paradox Basin FieldtripArches and Canyonlands National ParksStructural Geology, Fall 2005

La SalLa SalLaccolithLaccolith

Moab Valley

Moab Valley

Fisher Valley

Fisher Valley

Castle Valley

Castle Valley

Grabe

ns

Grabe

ns

UpheavalUpheavalDomeDome

SaltSalt--Cache Valley

Cache Valley

Paradox Valley

Paradox Valley

Colorado National Colorado National Monument UpliftMonument Uplift

SaltSalt--Cache Valley

Cache Valley

Paradox Valley

Paradox Valley

SaltSalt--Cache

Cache

MoabMoab

CastleCastle

FisherFisher

Airport

Airport

Joints -> Fins -> Arches

Joints -> Fins -> Arches

Joints -> Fins -> Arches

Extensional fractures at base of Landscape Arch (right) and Wall Arch (left)

Isolated Delicate Archand Arch remnants

Moab Fault

North

Detailed topography of Moab FaultNote hangingwall rollover

Cross section of Moab Anticline just north of Colorado River

Paradox BasinStratigraphicSection

Moab Faultrollover

Entrada

Wingate

Small antithetic faults in hangingwall of Moab master normal fault

Small synthetic fault in Hanging-wall of Moab fault

Moab Branch Fault

Define:

Sense of slipSlickenlinesChatter marksGouge

SlickensidesSlickenlinesChatter marksAsperities

Folded Rim

QuaternaryFill

Onion Creek

View north of Onion Creek diapir, Cache Valley rollover in distance, flat ground inForeground is Qal, red on right is Cutler Group strata

Core of rising Onion Creek Diapir

Gypsum Caprock in Onion Creek

Gypsum Caprock in Onion Creek

Upturned inner rim ofOnion Creek Diapir(Cutler Group)