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UNIVERSITY OF GOTHENBURG Department of Earth Sciences Geovetarcentrum/Earth Science Centre The US Cordillera Excursion 2015 Edited by Henrik Åslund Contributors Erik Alsteryd, Diana Carlsson, Sandra Davidsson, Anders Eurenius, Eric Floberg, Susanna Gelin, Alexandra Glommé, Rickard Haeggman, Annelie Helmfrid, Jimmy Jakobsson, Filip Johansson, Andreas Karlsson, Aron Kindbom Jonsson, Emma Kruse, Sara Kullberg, Lorenz Lindroth, Camilla Lindström, Caroline Lundell, Christoffer Åkesson, Henrik Åslund ISSN 1400-383X C122 Report Göteborg 2016 Mailing address Address Telephone Telefax Geovetarcentrum Geovetarcentrum Geovetarcentrum 031-786 19 56 031-786 19 86 Göteborg University S 405 30 Göteborg Guldhedsgatan 5A S-405 30 Göteborg SWEDEN The US Cordillera Excursion 2015 Contents Foreword .................................................................................................................................. viii Contributors ............................................................................................................................. viii Part I: Introduction .....................................................................................................................ix Preface ........................................................................................................................................ 1 Field stops................................................................................................................................... 2 Part II: Road logs ......................................................................................................................... 3 5 October – Picking up the mini-vans in Denver and arriving in Golden – Erik Alsteryd ....... 4 6 October – Red Rocks – Aron Kindbom Jonsson .................................................................. 4 7 October – Golden to Steamboat Springs – Sandra Davidsson ............................................ 5 8 October – Steamboat Springs to Dinosaur National Monument – Sandra Davidsson ....... 6 9 October – Dinosaur National Monument – Sara Kullberg .................................................. 7 10 October – Rock Springs – SLC – Caroline Lundell .............................................................. 7 11 October – Salt Lake and Wendover – Henrik Åslund ........................................................ 8 12 October – the Robinson Mine – Lorenz Lindroth ............................................................ 10 13 October – Zion National Park – Alexandra Glommé ....................................................... 10 14 October – The Navajo Bridge – Rickard Haeggman ........................................................ 11 15 October – The Descent of Grand Canyon – Anders Eurenius ......................................... 11 16 October – Grand Canyon to Las Vegas – Camilla Lindström ........................................... 13 17 October – Las Vegas to Red Rock Canyon – Henrik Åslund ............................................ 14 18 October – Red Rock Canyon Campground, Utah to Furnace Creek Campground, Nevada – Eric Floberg ........................................................................................................................ 14 19 October – Furnace Creek Campground to Motel 6 Mammoth Lake, CA – Annelie Helmfrid ................................................................................................................................ 15 20 October – Mammoth Lakes – Filip Johansson ................................................................ 16 21 October – Från Yosemite till Sierra Nevada – Christoffer Åkesson................................. 17 22 October – San Francisco – Andreas Karlsson .................................................................. 17 23 October – Return of the Geeks – Jimmy Jakobsson ........................................................ 18 Part III: Essays ........................................................................................................................... 19 1 The Unclear Origin of the Ancestral Rocky Mountains ..................................................... 20 Alexandra Glommé Abstract ................................................................................................................................ 20 i The US Cordillera Excursion 2015 Introduction .......................................................................................................................... 20 Theories ................................................................................................................................ 22 Summary .............................................................................................................................. 23 References ............................................................................................................................ 24 2 The Dakota Formation and its Associated Flora and Fauna ............................................ 25 Sandra Davidsson Introduction .......................................................................................................................... 25 The Dakota Formation .......................................................................................................... 25 Flora ...................................................................................................................................... 28 Fauna .................................................................................................................................... 29 Climate ................................................................................................................................. 31 Conclusions ........................................................................................................................... 32 References ............................................................................................................................ 32 3 The Morrison Formation of Late Jurassic age: An Overview of the Paleontology, Paleoenvironment and Paleoclimate During Deposition ........................................................ 35 Camilla Lindström Introduction .......................................................................................................................... 35 Geology and Tectonic Setting .............................................................................................. 36 Paleoclimate Overview ......................................................................................................... 38 Paleontology Overview ........................................................................................................ 38 Conclusions ........................................................................................................................... 41 References ............................................................................................................................ 41 4 The Yavapai Province, Crustal Growth and Metamorphic Development ......................... 43 Diana Carlsson Abstract ................................................................................................................................ 43 Introduction .......................................................................................................................... 43 The Yavapai Province ........................................................................................................... 43 The Yavapai orogen and metamorphic development ......................................................... 45 Summary .............................................................................................................................. 47 References ............................................................................................................................ 48 5 Western Interior Seaway - Sedimentology and Stratigraphy in Relation to the Sevier Orogenic Belt ............................................................................................................................ 49 Anders Eurenius ii The US Cordillera Excursion 2015 The Western Interior Seaway ............................................................................................... 49 The Sevier orogeny ............................................................................................................... 50 Environments and lateral extent of the Western Interior Seaway ...................................... 50 Sediment from the Sevier .................................................................................................... 51 Tectonic effects on subsidence and sedimentation ............................................................ 52 Summary .............................................................................................................................. 53 References ............................................................................................................................ 54 6 Sierra Nevada-Batoliten .................................................................................................... 55 Sara Kullberg Abstrakt ................................................................................................................................ 55 Introduktion ......................................................................................................................... 55 Tektonisk utveckling 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