Tertiary Extension and Fault-Block Rotation in the Transition Zone, Cedar Mountains Area, Arizona

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Date Published: 
May 2005
Authors: 
Arizona Geological Survey

New geologic mapping from the Cedar Mountains - Bloody Basin - Cooks Mesa area in the central Arizona Transition Zone presents an enigmatic geologic relationship that has previously gone unstudied. Here, fault blocks of Early Proterozoic basement overlain by Tertiary sedimentary and tuffaceous-lacustrine deposits and capped by a thick accumulation of basalt flows, dated in the project area between 15.1 and 13.5 Ma, are rotated ~20o west to west-southwest along east-dipping normal faults.

Reference Information: 

Brand, P.K., and Stump, E. 2005. Tertiary Extension and Fault-Block Rotation in the Transition Zone, Cedar Mountains Area, Arizona v. 1.1: Arizona Geological Survey Contributed Map CM-11-A.

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Temporary Contact Update

The Tonto Supervisor’s Office in Phoenix remains temporarily closed in July 2019 due to a building renovation project. As a result, questions from the media and general public regarding the Resolution Copper Project and Land Exchange should be e-mailed to John Scaggs at: john.scaggs@usda.gov

EIS Timeline - Feb 2019

  1. Proponent submits revised Plan of Operations [Sep 2014]
  2. Federal Register Notice of Intent to prepare EIS [Mar 2016]
  3. Public scoping period and scoping meetings
    [5 meetings between Mar-Jun 2016; comment period extended from 60 days to 120 days, closed Jul 18, 2016 ]
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  5. Prepare project description and identify project alternatives
  6. Publish Alternatives Evaluation Report [Sep 2017]
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    Validate Baseline Information; analyze environmental effects
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  9. Federal Register Notice of Availability of Draft EIS
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