U. S. Highways U. S. Highway 91 (Continued)  

Tom Schweich  

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Literature Cited
 For the most part US Highway 91 has been replaced by US Interstate 15. There are two segments of US Highway remaining. A northern segment follows a route abandoned by I-15 from just south of Pocatello, Idaho, through Logan, Utah, and then into the Great Salt Lake basin, where I-15 is rejoined. The southern segment of US Highway 91 heads west from Saint George, Utah then turns south to Littlefield, Arizona, bypassing the route that I-15 now takes through the Virgin River Canyon.
  The northern segment of US Highway 91 is found on the previous page
The southern segment of US Highway 91 is below.

 

 

Other articles: Interstate 15 in St George

Locations: Saint George.  

St. George

Junction: US Interstate 15, North to Salt Lake City, South to Las Vegas.

 

   

Santa Clara

 

Literature Cited:
- Retallack, Gregory J., 2009.

Locations: Ivins.  

The town of Ivins is just to the northeast of the highway.

Just to the northeast of Ivins is a paleosol collection site in the Triassic to Jurassic Chinle, Moenave, and Kayenta formations used by Retallack in his 2009 study of greenhouse crises of the past 300 million years. Retallack used stomatal index data for fossil Ginko and related leaves as a proxy for past CO2 spikes and paleosol chemical data as proxies for temperature and humidity changes. These data show that global warming due to CO2 rise is a not a unique event in earth history and that the magnitude of the coming anthropogenic greenhouse pales in comparison with past greenhouse spikes at times of global mass extinctions.

 

   

Shivwits

 

Other articles: Gunlock Road at Old US Hwy 91  

Junction: County Route 3184 "Gunlock Road"

 

 

Other articles: Mojave Desert Joshua Tree Road at US Hwy 91  

Junction:

Junction: Mojave Desert Joshua Tree Road to area where Frasera albomarginata was found.

Other articles: Beaver Dam Mountain Road at old US Hwy 91  

Junction: Beaver Dam Mountain Road

 

   

Utah Hill Summit

 

 

   

CastleCliff

 

 

 

Other articles: Mojave Desert Joshua Tree Road at US Hwy 91  

Junction:

Junction: Mojave Desert Joshua Tree Road
  Utah above
Arizona below

 

 

Other articles: Interstate 15 in Littlefield  

Littlefield

Junction: US Interstate 15, north to St. George; south to Las Vegas.

 

 

   

Literature Cited

  A list of all literature cited by this web site can be found in the Bibliography.
  Hart, William S., Jay Quade, David B. Madsen, Darrell S. Kaufman, and Charles G. Oviatt. 2004. The 87Sr/86Sr ratios of lacustrine carbonates and lake-level history of the Bonneville paleolake system. GSA Bulletin. 116(9/10):1107-1119.
  Retallack, Gregory J. 2009. Greenhouse crises of the past 300 million years. GSA Bulletin. 121(9/10):1441-1455. {TAS-pdf}
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Date and time this article was prepared: 12/6/2018 3:18:43 PM