Utah Geological Survey

 

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PERMIAN PARK CITY FORMATION

index map showing location
Ppc bridge
Ppc geologic map

The southern slope of Mill Creek Canyon consists of Weber Quartzite (IPw) overlain by Park City Formation (Ppc) limestones and the northern slope consists of Park City Formation gray limestones overlain by lower Woodside Shale (TRw) and the Thaynes Formation (TRt) Map Units.

The Park City Formation limestones were deposited in the developing Oquirrh Basin in Northwestern Utah.

A major worldwide extinction occurred sometime in a 10 million year time gap between deposition of the Park City Formation and the deposition of the overlying Woodside Shale. The only obvious indication of some kind of event in Mill Creek is the change from a fossiliferous Park City gray limestone into a unfossiliferous Woodside red shale.

Ppc formation, bridge

rhombohedral jointing, Ppc formation

 Ppc formation grooved slickenside
Evidence of faulting and folding stresses in the Permian Park City formation limestone. Massive beds display rhombohedral jointing and slickensides. Less massive beds are shattered into small pieces. Fault Evidence

 

 

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