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Brighan Young University Geology Studies GEOLOGY I YOUNG STUDIES f UNIVERSITY Volume 12 December 1965 r' r' CONTENTS Thrusting in the Southern Wasatch Mountains, Utah ........ Michael J. Brady 3 Nebo Overthrust, Southern Wasatch Mountains, Utah ........ B. Allen Black 55 Paleoecologic implications of Strontium, Calcium, and Magnesium in Jurassic rocks near Thistle, Utah .... Button W. Bordine 91 Paleoecology of the Twin Creek Limestone In the Thistle, Utah area .................................... .... .....Ladell R. Bullock 121 Geolo of the Stockton stock and related intmsives, &1e County, Utah ................................................. John L. Lufkin 149 Stratigraphy and rifera of Ordovician rocks near Columbia Iceads, Jasper National Park, Alberta, Canada .............................................................. .. .... J. Keith Rigby 165 Lower Ordovician conodonts and other microfossils from the Columbia Icefields Section, Alberta, Canada ........................... .. .......... R. L. Ethington and D. L. Clark 185 Publications and maps of the Geology Department ........................... .. ..... 207 Brigham Young University Geology Studies Volume 12 - December 1965 Contents Thrusting in the Southern Wasatch Mountains, Utah ........ Michael J. Brady 3 Nebo Overthrust, Southern Wasatch Mountains, Utah ........ B. Allen Black 55 Paleoecologic irriplications of Strontium, Calcium, and Magnesium in Jurassic rocks near Thistle, Utah .... Burton W. Bordine 91 Paleoecology of the Twin Creek Limestone in the Thistle, Utah area .................................................... Ladell R. Bullock 121 Geology of the Stockton stock and related intrusives, Tooele County, Utah .................................................... John L. Lufkin 149 Stratigraphy and porifera of Ordovician rocks near Columbia Icefields, Jasper National Park, Alberta, . Canada .......................................................................... J. Kelth Rlgby 165 Lower Ordovician conodonts and other microfossils from the Columbia Icefields Section, Alberta, Canada ............................................ R. L. Ethington and D. L. Clark 185 Publications and maps of the Geology Department ........................................ 207 A publication of the Department of Geology Brlgham Young University Provo, Utah 84601 Ed~tor J. Keith Rigby Editorial Staff Lehi F. Hintze Myron G. Best Brzgham Your~gUniuerszty Geology Studres is published annually by the Department. Geology Studies consists of graduate student and staff research in the Department and occasional papers from other contributors, and is the successor to BYU Research Studies, Geology Serier, published in separate numbers from 1954 to 1960. Distributed December 31, 1965 Prrce $4.00 Thrusting in the Southern Wasatch Mountains, Utah* MICHAELJ. BRADY Murarhon 011 Co., Ljrrleton, Colorudo ~ss~Il~c~.-Laramldedeformation occurred in at least two separate pulses The first and least extensive was the result of compressional forces predominantly toward S 21"E. Later major Laramide structures were formed by forces towards approximately N 7OoE. and were superimposed upon structures formed by southeastward compressional forces in the Southern Wasatch area. Comparison of stratigraphic sections at Santaquin Canyon in the Southern Wasatch Mounta~nswlth stratigraphic sections at Long Ridge and the East T~ntlcMountains to the west shows little differences except progressive eastward th~nnlng, lnd~catlng that they are ln close proximity to the relative posltlons in which they were deposited. No evidence was found indicating major horizontal displacements having taken place be- tween these localities. New mapping of the Santaqu~nOverthrust suggests that all three of these sectlons are in the upper plate of a major thrust and were displaced a mlnlmum of seven miles in an easterly direction. The Santaquin Overthrust projects southward to the northern exposure of the Nebo Overthrust. Thus, it appears that the Santaquin thrust is a northern extension of the Nebo Overthrust. Directional properties associated w~ththe Red Point Thrust on the north end of Dry Mountain indicate displacement towards S.17'E. At the south end of West Moun- tain thrusting was probably toward N.45"-7O0E. Remapping of thrusts In Payson Canyon revealed the presence of a large fmster just east of Maple Dell Scout Camp where Oqulrrh Forlnat~onIn the upper plate has been eroded, exposing Cambrian and Miss~sslppianstrata of the lower plate. CONTENTS TEXT Humhug Formation .................. 10 page Great Blue Limestone ............... 31 Introduction ............. ......................... 4 Miss~ss~ppian-Pennsylvanian............ 32 Stratigraphy ...................................... ....... 5 Mannlng Canyon Shale ........... .... 32 General Statement ........................... .... 5 Pennsylvanian-Permian .......... ....... 32 Precambr~an ................................... 6 Oqulrrh Formation . ................. 32 Farmington Canyon Complex .... 6 Permian .............................. ........... 3 3 B1g Cottonwood Formation . ...... 7 Kirkman L~mestone ..... ... ......... 33 Cambrian ....................................... ........ 7 Cretaceous-Tertlary .............. .. .. ... ... 3 3 Tint~cQuartzite ............................ 7 North Horn Formation ......... ...... 33 Ophir Formation ........................ 8 Tertiary ......................................... 33 Teutonic Limestone . ................ 9 Flagstaff L~mestone ................. .. 33 Dagmar Limestone .................... 11 Colton Formation ....................... 34 Herk~merLimestone .................... 12 Moroni Formation ........................ 34 Bluebird Dolomite .................... 15 Summary and Conclusions ............ 34 Cole Canyon Dolomrte ................ 17 Structure ............. .................................. 36 Opex Format~on ........................ 19 Pre-Laramide Deformation ............ 36 Ajax Dolomite ............................ 2 1 Laram~deDeformation ............. ...... 36 Devonlan ....................................... ..... 22 Cenozo~cDeformation .................. 37 Victorla Formation .................... 22 Thrusts ........................................ 37 Pinyon Peak Limestone ................ 23 Santaquin Overthrust ................ 37 M~ss~ssippian.................................... 23 Payson Canyon Thrust ............... 41 Fltchvllle Formation ................. .. 24 Red Point Thrust ........................ 43 Gardison Limestone ................. .. 26 White Lake Hills Thrust ............ 43 Deseret Limestone ........................ 28 Keigley Quarries Thrust ............ 46 'A them submrted to the Faculty of the Department of Geology, Rrlgham Young Untverslty In partin1 fulfillment nf the requirements for the degree Macter of Srlenre MICHAEL J. BRADY CONTENTS West Mountain Thrust ................ 46 3. Correlation Chart, Causes of Thrusting in the Gardison Limestone .................... 26 Southern Wasatch area ................ 46 4. Cornpos~te Section .................... 35 Dlrect~onof Thrust~ngin the 5. Geologic map and sections, Southern Wasatch area ................ 48 Santaquin Overthrust ........ 38, 39 Amount of Displacement of Thrust 6. Geologic map and sections, Sheets In the Southern Wasatch Payson Canyon Thrust ............ 42 area ......................................... 49 7. Geologic map and sections, References Cited ................................ 52 Red Point Thrust .................... 44 8. Geologic map and section, ILLUSTRATIONS figure White Lake Hills Thrust ........ 45 1. Index Map ................................ 6 9. Isopach and tectonic map, 2. Correlation Chart. Oquirrh Basin ............................ 47 Herkimer Limestone ................ 13 10. Force diagram ............................ 50 ACKNOWLEDGMENTS The writer gratefully acknowledges the criticisms and help given by Dr. L. F. Hintze who suggested this problem and to the National Science Founda- tion which provided financial assistance in order that it might be completed. Appreciation is extended to other faculty members of the geology depart- ment for their assistance. Thanks are in order for suggestions given bv B. Allen Black, who worked concurrently with the writer on a related problem in the Mt. Nebo-Salt Creek area. INTRODUCTION The flrst extensive stratigraphic and structural investigation in the Southern Wasatch Mountains was done by G. F. Loughlin (1913) who measured sec- tions, collected fossils, and mapped the area along the Wasatch Range from Mt. Nebo to the north end of Dry Mountain. The first mention of thrusting in the area is found in this report when he states, "The principal structural features in the Santaquin-Mt. Nebo district are faults, including doubtful overthrusts of N.S. trend and a series of N.-S. and E.-W. block faults of the Basln Range type. The former are so poorly exposed, their course so nearly parallel to the N.-S. system of block faults, and, in some places, the rocks along them so free from severe crumpling or crushing, that the writer is not fully convinced of their overthrust character" (Loughlin, 1913, p. 448-449). A. J. Eardley (1933, 1934) mapped 230 square miles in an area extend- ing from Salt Creek Canyon, on the south, to a mile north of Santaquin. Eardley recognized thrust faulting ln his mapping of the Nebo and Santa- quin "Overthrusts". He estimated approximately one mile of crustal shortening in the Mt. Nebo area as the result of thrusting. His only specific mention of direction of movement is concerned with
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