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Geology of the Methow Valley Okanogan County, Washington Frontispiece

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Geology of the Methow Valley Okanogan County, Washington Frontispiece STATE OF WASHINGTON DEPARTMENT OF NATURAL RESOURCES BERT L. COLE, Commissioner of Public Lands DON LEE FRASER, Supervisor DIVISION OF GEOLOGY AND EARTH RESOURCES VAUGHN E. LIVINGSTON JR., State Geologist BULLETIN N0.68 GEOLOGY OF THE METHOW VALLEY OKANOGAN COUNTY, WASHINGTON By JULIAN D. BARKSDALE ' 1975 .. - WASHINGTON STATE LIBRARY 111~1111111111 Ill llll!l llll l!I Ill Ill 111111~~ AbOOOO 135493 GEOLOGY OF THE METHOW VALLEY OKANOGAN COUNTY, WASHINGTON FRONTISPIECE Methow Valley looking southeast from lower slopes of Last Chance Point. Goat Wall in the middle dis­ tance left is the result of glacial erosion of Midnight Peak Formation andesitic rocks. II STATE OF WASHINGTON DEPARTMENT OF NATURAL RESOURCES BERT L. COLE, Commissioner of Public lands DON LEE FRASER , Supervisor DIVISION OF GEOLOGY AND EARTH RESOURCES VAUGHN E. LIVINGSTON, JR., State Geologist BULLETIN N0.68 GEOLOGY OF THE METHOW VALLEY OKANOGAN COUNTY, WASHINGTON By JULIAN D. BARKSDALE 1975 \ For sale by Department of Natural Resources, Olympia, Washington Price $ 2.00 The publishing of this report on the Methow Valley was made possible by the generous financial contributions of the EXXON COMPANY Minerals Department, PLACER AMEX INCORPORATED, and QUINTANA MINERALS CORPORATION and THE U.S. GEOLOGICAL SURVEY IV FOREWORD Dr. Julian Barksdale, the author of this report, is the dean of the Methow River Valley geology. Berky, as he is known to his friends and colleagues, began his ~ork in the rugged Methow country in 1939 as a new Ph. D, recently hired by the University of Washington. During a field trip into the upper Methow late in 1938 with Dr. A. C . Waters and Professor and Mrs . Adolph Knopf, Mrs. Knopf advised Marajane, Berky's talented wife, that she should do everything possible to discourage Berky from undertaking such an enormous project. Nevertheless, Berky took on the project and for years, with Mara jane's continua I support, spent many summers in the Methow working out complex structure and stratigraphy. During those years he had some interesting experi­ ences, not the least of which was working as a cook for a pock-horse outfit to get transportation into the remote back country. He worked out of tent camps for weeks at a time, and sometimes suffered physically to accomplish his work. Dr. Barksdale has been subjected to occasional criticism for not publishing his work. I was one of the critics until Berky took me through the area on a 2-day field trip in the summer of 1974. After seeing firsthand the size of the project and the remoteness of some of the area, I came away with a different point of view. The logistics problems that he overcame were stagger­ ing in their magnitude, and the complexities of the geology would have discouraged most geologists. Dr . Barksdale has done o remarkable job in deciphering the geologic framework of the Methow area, and we ore fortunate to be able to make the information contained herein available to the geologic community. All of the geologists in the future who work in the Methow will be standing on Dr. Barksdale's shoulders. Vaughn E. Livingston, Jr. State Geologist March, 1975 V CONTENTS Foreword • • . • • • • • • • • • • • • • • • • • . • • • • • • • • • • • • . • . • • . • • • • • • . • . • • • • • • • • • • • • • • • • • • • • v Introduction • • • • • • . • • . • • • . • • . • • • • . • . • • . • . • • . • • . • • • • • . • . • • • • . • • • • • • • • • • . • • • • . 1 Location and geography •• • •••••••• ••. .•••••. •....... • •••..•••...•...••.•• ••• • .. Previous work . • • . • . • • • • • • • . • • . • . • . • . • . • • • • . • . • • • • • . • . • . • • . • • • • . • . 2 Present work and acknowledgments • • • . • . • • • • • • • • • • • • • . • • . • • . • • . • • . • • . • • • • • • • • • • 3 Geology..... • • . • • • . • • • • . • • • • . • . • • . • • . • . • • • . • • • • • • . • • . • . • • • • . • . • • • . • • 4 Metamorphic rocks . • . • • . • • • • • • • • • . • • . • • • • • • • • • • . • • • • • • • • • . • • . • • • • • . • • • • • . • . 4 Chelan botholithic complex • • . • . • • . • • • • • • • • • • . • . • . • • • . • • . • . • . • • . • • . • • . 4 Okanogan botholithic complex • • . • • . • • • • • • • • • . • . • • • • . • • • . • • . • . • • • • • • 6 Leecher Metamorphics... ..... .... .. ....... ............ .......... 7 Methow Gneiss • • . • . • • • • . • • . • • . • • • • • . • • . • • • • • • • • • . • • . • • • • • • • • • • . • • 8 lntrusi ve rocks • . • • . • • • • • • • . • • . • • • • . • • • . • . • • • • • • • • • . • . • • • • • . • • . • . • • • • • 9 Summit Creek pluton .•••• . ...•....•• .• •.•.••. ••••.•. .••.. •• ••.••••• . • , 9 Pasayten stock-dike . • • • . • • . • • . • • . • • • • • • • • • • • • • • • • • • • • • • . • • • . • • • • • . • 10 Button Creek stock . • • • • • • . • • . • . • • • • • • • • • • • . • . • . • . • • • • • • • • • • • • • • • • • • 11 Oval Peak botholith............................ ............... ........ 12 Carlton stocks • • . • • • • • • • • • • • . • • . • . • • • • • • • . • • • . • . • • • • . • . • . • • • • • • . 13 Fawn Peak stock • • • . • . • • . • • • • . • . • • • • • . • • • . • • • • . • • • • • • . • • • • • • • . • • • • • • • 13 Alder Creek stock • • • • • • • . • • • . • . • • • • • • • • . • . • • • • • • • • • • . • . • • • • . • • • • • . • 14 Black Peak botholith • • • • • • • • • • • . • . • • . • • • • • • • • • • . • . • • • . • • • • • • • • • • • • • • • 15 Noname stock . 17 Cooper Mountain botholith........... ................................ .. 17 Midnight stock . • • • • • • . • • . • • • • • • • . • • • • • • • • • • • . • • . • • . • • . • • • • • • • • • • • • • • • • 18 Texas Creek stock • • • • • • • • • • • . • • • • • • • • • • • • • • . • . • • • • • • • • • • • • • • • • • 18 Frazer Creek complex • • • • • • • • • • • • • • • • • • • • • • • • . • • • • • • • • . • • • • • • • • • . • • . • • • • 19 Monument Peak stock • • • • • • • . • • • • • . • • • • • • • . • • • • • • • • • • • . • • • • • . • • . • • • • 20 Golden Horn bothol ith • • • • • • • . • • • • • • • • . • • . • • . • • • • • • . • • • . • . • • • • • . • . • • • • 21 Surface accumulated rocks ••• •• •• ••• •••••••• ••. , • • • • • . • • • • • • • • • • • • • • • • • • • • • • • • • • 22 Newby Group, Undifferentiated • • • • • • • • • • . • • • • • • . • • • • • • • • . • • • • • • • • • • • • • . • 22 Twisp Formation • . • • • • • • • • • • • • • • • • • • • • • • • • . • • . • . • • • • • • . • • • • • • • • . • • . • • • • 22 Buck Mountain Formation • • • • • • • • • • • • • • • . • • • • . • • • • • • • • • • • • • • • • • • • • • . • • • • 24 Age and correlation • • • . • . • . • . • • • . • • • • • • • • • • • • • • • • . • . • • • • • • • • 25 Goat Creek Formation • • • • • • • • • • . • . • • • • • • • • • • . • • . • • • • • • • • • . • • • • • • • 27 Age and correlation • • • . • • . • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • . • • • • • • • 29 VII Geo logy-Continued Surface occumu lated rocks-Continued Panther Creek Fonnotion .• • •••.•.•••.••••••••••• . ••.•... .• • . • . •• . .. .. • 29 Age and correlation .• . •.• . •.. •.•••••••• •••.•• . ••.••••..••.••.••. 31 Harts Pass Formation ••••••••••• •.. •. .•.• •••.•• ..•..••.• . •. • .• • .. •••• 32 Age and correlation •...•.••..••.••••• , ••••••••.• •••••.•.•• . ••• : •. 35 Virginian Ridge Formation • , ••.••....•.• •. ••.•.. ..•.•.. •. .• .•• . ••. •. .•• . 37 Age and correlation •••••.•... .•. • .• • •• . .. ••..••.. .. • .••.• . .... 41 Winthrop Sandstone .•• • •.•.. ••••.•.• ••••••••.••.• . .•... .•.••.•. • ••••••. 42 Age and correlation .......•••••••.••••......•.•• •.••••• ....•••••. 44 Midnight Peak Formation ••••• , • • . •.•••• . ...•• . .••••. ••..• . • . • .• . .•• . 45 Ventura Member ..... ...•.......•.................•........•..• . 45 Ventura Member in the Midnight Peak syncline ••.• • •• . •.•• •••• 48 Ventura Member in the Goat Peak syncline .••.••••••••••••••• 48 Volcanic (upper) Member ..••.• •••• • ••••.•••.•••••.••••••••••••.•• 49 Volcanic (upper) Member in the Midnight Peak syncline . • .• • . • . 49 Volcanic (upper) Member in the Goat Peak syncline •.. •..•• • •• 49 Age and correlation •••.•.••• • ••.•..•. ••..••.•.•..••..• . ..••••. •• 50 Pipestone Canyon Formation ••••• . .. .••.•.. •• •. •• . .•... ..•. •. •••••• • . 51 Age and corre lotion •••.• . • • . • ... ..•..... •. • .• . .. .... .• • • . .• 51 G lociotion ••••• . • . • .••• . •.••••••••.....•.••.••• .• . • ••• •. •. .•...... .••.•..•. 53 Structure •• . ••••••••.•••••••• • ••.• •••• ..•• , , ••••.•..• · · · • · · · · • · • • · · • · · • • • · • · · · 56 Methow-Posoyten groben •••••••...•.••••. •• ...••. ••. ..••.•..•.....••. ••. 56 Bounding structures ••• . •••••••..••••.•• . .•.••.••.••••.•••••..•. •• 56 Structures within the graben .•.•. • . • •..••.••••. • •••. •.••••••.•• • •• 60 Folding •••••••.••••••••.••..•• • •. ••••••••••.•••• . ••••••• 60 Faulting •• • ••• . •••••.••.•••••.•••.• . ••. • . •..• . • , .• , ••• • • • 62 Geologic history • . ••...••••••••••••••...••••••..•••••.••.•• . .• . , . ••.. •.. , ••• 65 References cited •••••••••.••••• . •• • ••• ••••.•• •.• .. • •. • • ••••• • • • · · • · · · • · • · · · • • • • · · • • • · 69 VIII ILLUSTRATIONS Methow Va lley looking southeast from slope of Last Chance Point • • • . • • • • . • • • • • • • . • Frontispiece Plate 1. Geologic map of Methow Valley area, Washington ••••••••• . ....•.•.. In pocket Page Figure 1. Map showing location of area considered in this report . • • . • • • • . • . • • • . • 1 2. Methow Gneiss.
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