A fault that has thrust Precambrian rocks over Cambrian rocks. An unconformity (

Question

A fault that has thrust Precambrian rocks over Cambrian rocks.

      
An unconformity (nonconformity) where Cambrian rocks were deposited over Precambrian rocks.

      
A normal fault that dips to the west.

      
An intrusive contact between the metamorphic rocks and the sandstone.

What is the nature of the contact between the Deadwood Formation and the Englewood Limestone?

A fault that has thrust the Deadwood Formation over the Englewood Limestone.

      
An unconformity (disconformity) between the two east-dipping units.

      
A normal fault that dips to the west.

      
The two units are not in contact.

In following the contact between the Skull Creek Shale and the Sundance Formation from south to north across the map, which of the following is observed?

The Morrison Formation is locally preserved between the two units.

      
The Spearfish Formation locally crosses the Sundance Formation to contact the Skull Creek Shale.

      
The two units are not in contact.

      
The two units are everywhere in direct contact across the map.

Which of the following units are in contact with the base of the White River Group?

The Greenhorn Limestone

      
The Mowri Shale

      
The Sundance Formation

      
The Minnelusa Sandstone

      
All of these

What is the nature of the contact between the White River Group with the underlying formations?

A conformable contact.

      
An intrusive contact.

      
An angular unconformity.

      
A thrust fault.

The east-dipping units are part of the Black Hills uplift. Based on relationships in the map area, what is the age of this tilting?

Between the Precambrian and Cambrian.

      
Between the Permian and Triassic.

      
Between the Triassic and Jurassic.

      
Between the Jurassic and Cretaceous.

      
Between the Cretaceous and Tertiary.

peg p Esq peg 45 FIGURE 13.12 TERTIARY Tw pesq White River Group CRETACEOUS TW Kg 41 Greenhorn Limestone Kbm Mowry Shale Ks 45 Skull Creek Shale JURASSIC Jm Jm Cm Morrison Formation US Js Tw RS Sundance Formation Pm TRIASSIC Rs Spearfish Formation PERMIAN Rbm. Tw Kbma peg Pm Minnekahta Formation 19 CARBONIFEROUS 43 A 38 Cm Minnelusa Sandstone Englewood Limestone CAMBRIAN 35 Tw Deadwood Formation Cm PRECAMBRIAN Rs. US Kbma p-Eg granite and pegmatite p Esq miles metamorphic rocks Colored geological map of the southeastern portion of the Black Hills, South Dakota.

Explanation / Answer

1. A fault that has thrust Precambrian rocks over Cambrian rocks. Because the younger formations are existed below the archeans. Here dipping towards the younger rock formations. So by tectonic disturbances the older archean rock beds are uplifted above the younger.

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