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Uppermost Precambrian and Lowest Cambrian Rocks in Southeastern Idaho

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Uppermost Precambrian and Lowest Cambrian Rocks in Southeastern Idaho Uppermost Precambrian and Lowest Cambrian Rocks in Southeastern Idaho GEOLOGICAL SURVEY PROFESSIONAL PAPER 394 Uppermost Precambrian and Lowest Cambrian Rocks in Southeastern Idaho By STEVEN S. ORIEL and FRANK C. ARMSTRONG With contributions to early Middle Cambrian faunal zones By WILLIAM H. FRITZ (Geological Survey of Canada) and ALLISON R. PALMER (State University of New York at Stony Brook) GEOLOGICAL SURVEY PROFESSIONAL PAPER 394 Contrasts in rock sequences in the Bancroft, Soda Springs, and Preston quadrangles require new units for, and modified usages of, the names Brigham, Langston, and Ute UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1971 UNITED STATES DEPARTMENT OF THE INTERIOR ROGERS C. B. MORTON, Secretary GEOLOGICAL SURVEY W. A. Radlinski, Acting Director Library of Congress catalog-card No. 7&-179647 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price $2.25 (paper cover) Stock Number 2401-1179 CONTENTS Page Page Abstract. -__---_______-______-____.._ 1 Langston and Ute Limestones and associated rocks _ 20 Introduction -_--__-_________________ 2 Bancroft quadrangle. ____-_-___-_-_._-_-___ 20 Areas studied. __________________ 2 Twin Knobs Formation. _______________ 20 Acknowledgments- __ ____________ 5 Name- ----_----_--------_-------- 20 Facies. __--_-_-__-______-_______ Type.___- __-_-___---__--___-----_ 20 Brigham Quartzite_ __________________ Composition- __ ___________________ 20 Bancroft quadrangle. ____________ 6 Upper contact _ -_____-_-___-_.___ 21 Kasiska Quartzite Member. ___ 6 Distribution and thickness- _________ 21 Name_ __________________ 6 21 Type_. __________________ 6 Lead Bell Shale 22 Composition. ____________ 6 22 Contacts. _______________ 6 22 Distribution and thickness. 6 Composition ___-___--_-- 22 Age_ ----_---__._________ 6 Upper contact._____ ------ 22 General remarks.. _ _______ 7 Distribution and thickness. 22 22 Windy Pass Argillite Member. _ 7 23 Name ___________________ 7 Bancroft Limestone- - - 23 7 Name Type._.- ------------------- 23 Composition _____________ 7 Composition. _.____-_____-_- 23 Upper contact___-----____ 7 Upper contact_______----_--- 23 Distribution and thickness, 7 Distribution and thickness, _-_ 23 8 Age. __---_------__-----__-_ 23 Sedgwick Peak Quartzite Member. _ 9 Soda Springs quadrangle______ ________ 23 Name _______________________ 9 Nelson Creek area_ _ _______-___ 24 Type.. ______________________ 9 Langston Formation ______ _ 24 Composition. _ _______________ 9 Ute Limestone- _ ______ _ -__ 24 Upper contact_____-._________ 9 Egbert Canyon area_-___ ______ _ _ 24 Distribution and thickness. ____ 9 Langston(?) Formation____-_- 25 Age. __--__--._______________ 10 Ute Limestone. ____________ 25 Soda Springs quadrangle _ ____________ 10 Area southeast of Eightmile Creek 25 Nelson Creek area. ___-__--_______ 10 Langston(?) Formation --____ 25 Egbert Canyon area______ _________ 11 Ute Limestone ______________ 26 Area southeast of Eightmile Creek-­ 11 Contacts- ________-___ -_-_-_-_ 26 Contacts..... ____________________ 11 Top of Langston____-_____-__ 26 Age. _._.__. _____________________ 12 Top of Ute_ ._ . _ 26 Some nearby sections______ ____________ 12 Age _________-_-__-_______-_-__- 27 Portneuf Range_ _________________ 12 Langston(?) Formation. ___._- 27 Bannock Range. _..__..__________ 13 Ute Limestone- ___-_-_______ 27 27 Bear River Range. _______________ 13 Some nearby sections. ______ _ __-___ Portneuf Range. _______--_______ 27 Contacts. ________________________ 14 Bannock Range. _________-_-____ 28 Age. ____________________________ 15 Malad Range- ___-___------_---- 28 Meaning and problems of the Brigham__ 15 Bear River Range. ______________ 28 Previous usage. -______-____--____ 16 Contacts--.-------.------------ 30 Definition ___________________ 16 Top of Langston _ ________-_ 30 Idaho usage. _________________ 16 Top of Ute---_-_----------- 31 Utah usage. _________________ 16 31 Modifications proposed for Brigham. 17 Meaning of the terms Langston, Ute, and Spence_._ 31 Formation versus Quartzite _ 18 Previous usage- __-_- _ --- __--- ---- 31 Abandonment versus retention. 18 Definitions. _ ________-_-___.-_---------- 31 Restricted versus inclusive_____ 18 Emended definitions. ________ _ --- - 32 Regional relations. _______________ 19 Redefinitions. _ _____-__-__-_--_--------- 32 rii IV CONTENTS Page Page Langston and Ute Limestones and associated rocks Con. Blacksmith Limestone.___-___-_______---__- 45 Meaning of the terms Langston, Ute, and Spence Con. Bancroft and Soda Springs quadrangles.. 45 Modifications proposed here-_--_---_-_____.__ 32 Meaning and problems of the Blacksmith. 47 Lead Bell Shale, Spence and Cub Tongues__ 33 Previous usage.___________________ 47 High Creek Limestone___________________ 36 Definition.. __ _ _--.___________. 47 Langston Dolomite,____________________ 37 Emended definition. ___________ 47 Twin Knobs Formation and Naomi Peak Subsequent usage. _____________ 47 Tongue. _ ____________________________ 37 Some observations.________________ 48 Bancroft and Ute Limestones ____________ 37 Ages.___----_-_-___-----_-------------------__ 38 Regional relations. ____________ 48 Early Middle Cambrian-_ ___________________ 39 Vertical relations________-_-.__ 48 Middle Middle Cambrian.___________________ 41 Possible nomenclatural changes.. 48 Late Middle Cambrian._____________________ 44 References cited,_____-.__-_-_-_--_____-_-__ 48 Correlations. __ __________-_-________._-_--__ 45 Index-------_-___-_----------_-_-_-___-_. 51 ILLUSTRATIONS [Plates are in pocket] PLATE 1. Stratigraphic sections of the rocks beneath the Bloomington Formation in the Bancroft and Soda Springs quadrangles. 2. Stratigraphic sections of the upper part of the Brigham Quartzite measured southeastward along the Portneuf Range to the western part of the Bear River Range. 3. Described measured sections of the Brigham Quartzite and associated rocks in southeastern Idaho and northern Utah. 4-6. Described Stratigraphic sections between the Bloomington Formation and the Brigham Quartzite showing former and new rock-stratigraphic assignments: 4. Eastward from the Bannock Range, across the Portneuf Range to the northeastern Bear River Range. 5. Eastward from the Malad Range, across the southern part of Portneuf Range to the east side of the Bear River Range. 6. Eastward across the Wasatch Range in northern Utah. 7. Sections showing relation of rock-stratigraphic assignments in the Bancroft and Soda Springs quadrangles to recog­ nized Cambrian faunal zones. FIGURE 1. Index map of southeastern Idaho and northern Utah, showing the locations of the Bancroft, Soda Springs, and Preston quadrangles and of the Stratigraphic sections discussed--- ____..______-__-_-______-_____---____ Relief map of southeastern Idaho and northern Utah, showing the major physiographic features mentioned and their relations to the Bancroft, Soda Springs, and Preston quadrangles- ___--__-_-_____________-______.. 3. Geologic map of sees. 12 and 13, T. 10 S., R. 38 E., and sees. 7 and 18, T. 10 S., R. 39 E., in the Bancroft quad­ rangle, showing the locations of measured and type sections of new rock-stratigraphic units. _____________ 8 4. Maps showing the areal distribution of dominant rock types deposited in southeastern Idaho and northern Utah during Middle Cambrian times and in late Early Cambrian time_-_----_-_____________________________ 34 5. Diagrammatic west-to-east section of the rocks between the Bloomington Formation and the Brigham Quartzite, showing the distribution of lades and the Stratigraphic relations of rocks named or redefined in this report,. 36 6. Diagram showing horizons of trilobites collected from Twin Knobs Formation on the north side of Two Mile Canyon in the Malad Range-______________________-_-________,__-_---___---____._---------_-____ 40 7. Diagram showing horizons of trilobite collections from the Lead Bell Shale and adjoining units._____________ 42 8. Checklist of faunules collected by W. H. Fritz_____-____------_---_____----------------------_-_------- 46 UPPERMOST PRECAMBRIAN AND LOWEST CAMBRIAN ROCKS IN SOUTHEASTERN IDAHO By STEVEN S. ORIEL and FRANK C. ARMSTRONG ABSTRACT Above the Brigham in the Bancroft quadrangle are several distinctive rock units here assigned to new formations. The low­ The lowest rocks exposed in the Portneuf Range within the Bancroft quadrangle and in the Bear River Range within the est, the Twin Knobs Formation, is about 600 feet thick and is divisible into three informal members. The lowest, 300-400 feet Soda Springs quadrangle differ markedly in both composition and unit sequence from place to place. The former inconsistent thick, consists of interbedded brown calcareous sandstone, green application of the names Brigham Quartzite, Langston Lime­ and gray quartzite, and mainly medium to dark-gray partly stone, Ute Limestone, and Blacksmith Limestone to comparable coarsely crystalline, partly subaphanitic, and partly oolitic lime­ stone. The middle member, about 20 feet thick but absent from rocks in nearby areas has masked these marked and significant differences. some sections, consists of green claystone. The upper member, 200-300 feet thick, consists of prominent ledges of Girvcmella- Three subdivisions of the Brigham Quartzite in the Bancroft bearing limestone. The Twin Knobs Formation is assigned, on quadrangle are recognized and named here. The lowest, the Kasiska Quartzite Member, is more than 1,600 feet thick and the basis of stratigraphic position and regional
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