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Professional Paper 1662

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# Studies by the U.S. Geological Survey in Alaska, 2000

#### Frederic H. Wilson and John P. Galloway, Editors

| Introduction
Oblique aerial photograph of Mount Griggs stratovolcano. Most of the 7,650 ft-high edifice consists late Pleistocene and Holocene lava flows and agglutinate. Knife Creek tributary streams bounding volcano are the Griggs Fork (right) and the Juhle Fork (left). Beyond the Juhle Fork is Mount Juhle, which consists largely of Jurassic marine sedimentary strata of the Naknek Formation, intruded by a Tertiary porphyritic granitoid pluton. Broken Mountain (lower left), Knife Creek valley (part of the Valley of Ten Thousand Smokes), and glacier (lower right) are covered by pyroclastic-flow and fall deposits from 1912 eruption of Novarupta (out of view to left). View is northward across upper Knife Creek. Photo by USGS. 

The collection of  papers that follows continue the series of U.S. Geological Survey (USGS) investigative reports in Alaska under the broad umbrella of the geologic sciences. The series presents new and sometimes preliminary findings that are of interest to earth scientists in academia, government, and industry; to land and resource managers; and to the general public. Reports presented in Geologic Studies in Alaska cover a broad spectrum of topics from various parts of the State (fig. 1), serving to emphasize the diversity of USGS efforts to meet the Nation's needs for earth-science information in Alaska. | First posted December 18, 2002

Download the following parts of this publication:          
- Introduction     By  Fredric H. Wilson and John P. Galloway 
-   Chapter 1.   Geochemistry and Age Constraints on Metamorphism and Deformation in the Fortymile River Area, Eastern Yukon-Tanana Upland, Alaska    By  Warren C. Day, John N. Aleinikoff, and Bruce Gamble 
-   Chapter 2.   Stratigraphy, Age, and Geochemistry of Tertiary Volcanic Rocks and Associated Synorogenic Deposits, Mount McKinley Quadrangle, Alaska    By   Ronald B. Cole and Paul W. Layer 
-   Chapter 3.  Stratigraphic and Provenance Data from the Upper Jurassic to Upper Cretaceous Kahiltna Assemblage of South-Central Alaska    By   Kevin R. Eastham and Kenneth D. Ridgway 
-   Chapter 4.  Late Triassic (Norian) Mollusks From the Taylor Mountains Quadrangle, Southwestern Alaska    By   Christopher A. McRoberts and Robert B. Blodgett 
-   Chapter 5.  Notes on the Bedrock Geology and Geography of the Stikine Icefield, Coast Mountains Complex, Southeastern Alaska    By   David A. Brew and Richard M. Friedman 
-   Chapter 6.  Mount Griggs: A Compositionally Distinctive Quaternary Stratovolcano Behind the Main Volcanic Line in Katmai National Park     By   Wes Hildreth, Judy Fierstein, Marvin A. Lanphere, and David F. Siems 
-   Chapter 7.  Treeline Biogeochemistry and Dynamics, Noatak National Preserve, Northwestern Alaska     By   Robert Stottlemyer, Dan Binkley, and Heidi Steltzer 
-   Chapter 8.  Environmental-Geochemical Study of the Slate Creek Antimony Deposit, Kantishna Hills, Denali National Park and Preserve, Alaska     By   Robert G. Eppinger, Paul H. Briggs, James G. Crock, Allen L. Meier, Stephen J. Sutley, and Peter M. Theodorakos 
-   Reports on Alaska  — U.S. Geological Survey reports on Alaska, and non-USGS reports on Alaska released in 2000 

Return to *Studies by the U.S. Geological Survey in Alaska* main page 
- These publications are online only  

**For additional information, contact:**Alaska Science Center staff U.S. Geological Survey4210 University Dr.Anchorage, AK 99508Alaska Mineral ResourcesAlaska Science Center 

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### Suggested citation:

Wilson, F.H., and Galloway, J.P., eds., 2002, Studies by the U.S. Geological Survey in Alaska, 2000: U.S. Geological Survey Professional Paper 1662, 149 p., https://pubs.usgs.gov/pp/pp1662/.

ISSN 2330-7102 (online)

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###     Contents

Introduction *By* Fredric H. Wilson and John P. Galloway 

 Chapter 1.  Geochemistry and Age Constraints on Metamorphism and Deformation in the Fortymile River Area, Eastern Yukon-Tanana Upland, Alaska *By* Warren C. Day, John N. Aleinikoff, and Bruce Gamble 

 Chapter 2.  Stratigraphy, Age, and Geochemistry of Tertiary Volcanic Rocks and Associated Synorogenic Deposits, Mount McKinley Quadrangle, Alaska *By* Ronald B. Cole and Paul W. Layer 

 Chapter 3. Stratigraphic and Provenance Data from the Upper Jurassic to Upper Cretaceous Kahiltna Assemblage of South-Central Alaska *By* Kevin R. Eastham and Kenneth D. Ridgway 

 Chapter 4. Late Triassic (Norian) Mollusks From the Taylor Mountains Quadrangle, Southwestern Alaska *By* Christopher A. McRoberts and Robert B. Blodgett 

 Chapter 5. Notes on the Bedrock Geology and Geography of the Stikine Icefield, Coast Mountains Complex, Southeastern Alaska *By* David A. Brew and Richard M. Friedman 

 Chapter 6. Mount Griggs: A Compositionally Distinctive Quaternary Stratovolcano Behind the Main Volcanic Line in Katmai National Park *By* Wes Hildreth, Judy Fierstein, Marvin A. Lanphere, and David F. Siems 

 Chapter 7. Treeline Biogeochemistry and Dynamics, Noatak National Preserve, Northwestern Alaska *By* Robert Stottlemyer, Dan Binkley, and Heidi Steltzer 

 Chapter 8. Environmental-Geochemical Study of the Slate Creek Antimony Deposit, Kantishna Hills, Denali National Park and Preserve, Alaska *By* Robert G. Eppinger, Paul H. Briggs, James G. Crock, Allen L. Meier, Stephen J. Sutley, and Peter M. Theodorakos 

 Reports on Alaska — U.S. Geological Survey reports on Alaska, and non-USGS reports on Alaska released in 2000 

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