DOCSLIB.ORG

Recent Beach and Dune Sands, Alluvium, and Tidal Flat Muds

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Recent Beach and Dune Sands, Alluvium, and Tidal Flat Muds AN ABSTRACT OF THE THESIS OF FRANK BEECHER CRESSY, JR.for theMASTER OF SCIENCE (Name ofstudent) (Degree) in GEOLOGY presentedon , / 3 7 3 (Major) (Date) Title: STRATIGRAPHY AND SEDIMENTATION OF THE NEAHKAHNIE MOUNTAIN - ANGORA PEAK AREA, TILLAMOOK AND CLATSOP COUNTIES,OREGON Abstract approved: Dr. Alan R. Niem Four distinct lithologic units compose the Tertiary rocks of the Neahkahnie Mountain - Angora Peak area, located along the northwest Oregon coast near the town of Nehalem.The Tertiary units are the late Oligocene to early Miocene Oswald West mudstones, the middle Miocene Angora Peak sandstone member of the Astoria Formation, and middle Miocene intrusive and extrusive rocks of the Depoe Bay Basalt.These units are unconformably overlain by Pleistocene and Recent beach and dune sands, alluvium, and tidal flat muds. The Oswald West mudstones and the Angora Peak sandstone member are informal stratigraphic units proposed in this study. The Oswald West mudstones consist of over 1600 feet of well- bedded, highly burrowed, tuffaceous siltstones and silty mudstones interbedded with minor amounts of graded turbidite sandstones and submarine slump deposits.Foraminifera and tracefossils suggest deposition occurred in marine waters of upper bathyal depths. The Angora Peak sandstone consists of over 1800 feet of thin- to thick-bedded, locally cross-bedded, fine- to coarse-grained arkosic sandstones, pumiceous and basaltic conglomerates, carbon- aceous and micaceous siltstones, and local coal beds.The inter- fingering shallow marine and fluvial sandstones are interpreted to have been deposited in a high-energy, wave dominated, deltaic envi- ronment which reworked the sediments into extensive delta-front sheet sands similar to those observed in the modern Niger and Rhone deltas.Mineralogy, heavy minerals, and conglomerate clast lithol- ogies indicate that most of the sediments were derived from local uplifted areas of Eocene basalts and early Tertiary sediments and from the Oligocene Little Butte Volcanics in the western Cascades. Rare metamorphic and plutonic clasts, sedimentary quartzite, heavy minerals, and sandstone mineralogy suggest that metamorphic, igneous, and Paleozoic sedimentary terranes in eastern Oregon and Washington, British Columbia, Idaho, and Montana supplied some of the sediments, possibly via an ancestral Columbia River. Dikes, sills, and plugs of aphanitic to finely crystalline Depoe Bay Basalt intrude the older sedimentary rocks and locally are feeders for palagonitized pillow breccias which unconformably overlie the Angora Peak sandstone.The major intrusive body is a 1200-foot thick diabasic sill referred to as the Neahkahnie sill.The extrusive basalts formed in a subsiding marine basin in which over 1600 feet of pillow lavas, pillow breccias, and minor basalt flows were locally extruded. The area is cut by a series of west-northwest and north-trending faults.Two synclines and an anticline strike subparallel to the west- northwest trending faults. Stratigraphy and Sedimentation of the Neahkahnie Mountain - Angora Peak Area, Tillamook and Clatsop Counties, Oregon by Frank Beecher Cressy, Jr. A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Master of Science June 19 74 APPROVED: Assistant Professor of Geology in charge of major hairman, Department of Geology Dean of Graduate School Date thesis is presented Typed by Opal Grossnicklaus for Frank Beecher Cressy, Jr. ACKNOWLEDGEMENTS The writer wishes to express his thanks to the Society of the Sigma Xi for a Grant-in-Aid for Scientific Research which helped to defray field and laboratory expenses. Special thanks are extended to Dr. Alan R. Niem, my major professor, for his help and advice both in the field and during the writing of this thesis.Drs. K. F. Oles and E. M. Taylor of Oregon State University critically read the manuscript.Parke D. Snavely, Jr. and Norman S. MacLeod of the U. S. Geological Survey also critically read the manuscript and contributed many helpfulsugges- tions and information in discussions about northwest Oregon geology, and in particular, about the thesis area.Microfossil identification and paleoecological data provided by Weldon W. Rau of the Washington Department of Natural Resources, megafossil identification and infor- mation provided by W. O. Addicott of the U. S. Geological Survey, and trace fossil identificationby C. K. Chamberlain of Ohio Univer- sity were all greatly appreciated.Chemical analyses of coals in the area were providedby F. E. Walkerof the U. S. Bureau of Mines. Lastly I would like to thank my parents, whose moral and monetary support was gratefully accepted. TABLE OF CONTENTS INTRODUCTION 1 Location and Accessibility 1 Purposes of Investigation 3 Previous Work 3 Methods of Investigation 6 Field Methods 6 Analytical Methods REGIONAL STRATIGRAPHY 10 DESCRIPTIVE GEOLOGY OF THE THESIS AREA 16 Oswald West Mudstones 16 Lithologies and Structures 17 Contact Relations 23 Age and Correlation 29 Depositional Environment 31 Astoria Formation 33 Angora Peak Sandstone Member 36 Lithologies and Structures 38 Contact Relations 45 Age and Correlation 46 Depositional Environment 49 Depoe Bay Basalt 53 Intrusive Rocks 54 Occurrence and Distribution 54 Lithologic Character 56 Petrology 57 Contact Relations 6Z Extrusive Rocks 63 Occurrence and Distribution 63 Lithologic Character and Petrology 63 Contact Relations 67 Origin 67 Age and Correlation 68 Quaternary Deposits 69 PETROLOGY OF THE SEDIMENTARY UNITS 73 Sandstones 73 Terminology and Classification 73 Textural Aspects 74 Framework Mineral and Rock Components 79 Quartz 79 Feldspar 80 Rock Fragments 82 Mica 84 Heavy Minerals 85 Authigenic Minerals 85 Conglomerate Pebbles 86 Exotic Pebbles 90 Matrix 92 Cement 93 STRUCTURAL GEOLOGY 94 Regional Structure 94 Structure of Thesis Area 94 GEOLOGIC HISTORY 101 Transport Directions 101 Provenance 103 Summary and Conclusions 107 ECONOMIC GEOLOGY 110 Coal 110 Petroleum 114 Crushed Rock 116 BIBLIOGRAPHY 118 APPENDICES 125 APPENDIX I. Principal Reference Section of the Oswald West Mudstones 132 APPENDIX II. Principal Reference Section of the Angora Peak Sandstone 133 APPENDIX III. Log of Necarney Hydrocarbon Oil Company Well 138 APPENDIX IV. Checklist of Fossils from the Oswald West Mudstones 139 APPENDIX V. Checklist of Fossils from the Angora Peak Sandstone 142 APPENDIX VI. PebbleLithologies of Conglomerates in the Angora Peak sandstone member of the Astoria Formation 144 APPENDIX VII.ModalAnalyses of Selected Samples 145 APPENDIX VIII.SizeAnalyses of Selected Sandstone Samples 147 APPENDIX IX. Heavy Mineralogyof Selected Samples 148 LIST OF FIGURES Figure Page 1. Index map showing the location of the Neahkahnie Mountain - Angora Peak area. 2 2. Correlation chart of the Tertiary formations of the Northern and Central Oregon Coast Range. 11 3. Well-bedded siltstones and mudstones of the Oswald West mudstones. 18 4. Well-bedded tuffaceous siltstones of the upper part of the Oswald West mudstones. 18 5. Submarine slump deposit in the Oswald West mudstones. 21 6. Burrowing pattern of Zoophycos on bedding plane in the Oswald West mudstones. 21 7. Highly burrowed tuffaceous silty mudstone from the Oswald West mudstones. 24 8. Contact between well-bedded Oswald West mudstones and Angora Peak sandstones in seacliffs south of Short Sand Beach. 26 9. Fluvial channel in the Angora Peak sandstone. 40 10. Alternating beds of climbing ripple lamination and parallel lamination in fine-grained Angora Peak sandstone. 40 11. Coal bed in the lower part of the Angora Peak sandstone. 42 12. Cross-bedded pebbly sandstone in a fluvial sequence in the Angora Peak sandstone. 42 13. Graded conglomerate beds in the Angora Peak sandstone. 44 Figure Page 14. Large sandstone boulder in a poorly sorted conglom- erate in the Angora Peak sandstone. 44 15. Mytilus middendorffi and Spisula albaria in a concretion, Angora Peak sandstone. 47 16. Extrusive pillow breccias and pillows of Depoe Bay Basalt forming Angora Peak. 55 1 7. Neahkahnie sill intruding well-bedded Oswald West mudstones at Cape Falcon. 55 18. Small dike of Depoe Bay Basalt intruding pillow breccias of extrusive Depoe Bay Basalt. 58 19. Pseudo-pahoehoe flow structures on top of the Neahkahnie sill. 58 20. Deuteric alteration of light green pyroxene to brown hornblende in tholeiitic diabase of Depoe Bay Basalt. 60 21. Perlitic cracks in basaltic glass fragment from extrusive pillow breccias of Depoe Bay Basalt. 60 22. Weathered boulder of basaltic pillow breccia of Depoe Bay Basalt. 65 23. Fresh outcrop of basaltic pillow breccia of Depoe Bay Basalt. 65 24. Panoramic view of Nehalem Bay and sandspit. 70 25. Classification of Angora Peak and Oswald West sandstones. 75 26. Stained rock billets from the Angora Peak sandstone, 81 27. Angular and subangular quartz and microcline in a poorly sorted Angora Peak sandstone. 81 28. Unaltered and highly altered plagioclase grains in a Angora Peak sandstone. 87 Figure Pa e 29. Dark green glauconite pellets in a fine-grained Angora Peak sandstone. 87 30. Percent variation in pebble lithologies in conglomer- ates of the Angora Peak sandstone. 87 31. Exotic pebbles from conglomerates in the Angora Peak sandstone. 91 32. Structural map of the Neahkahnie Mountain - Angora Peak area. 95 33. Looking southeast along the axis of a sycline in the lower part of the Angora Peak sandstone. 97 34. Rose diagrams of paleocurrent measurements from the Angora Peak sandstone. 102 35. Map of reported coal occurrences in the Neahkahnie
Load more

Recommended publications
  • Ore Bin / Oregon Geology Magazine / Journal
    Vol . 37, No.2 Februory 1975 STATE OF OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES The Ore Bin Published Monthly By STATE OF OREGON DEPARTMENT OF GEOlOGY AND MINERAL INDUSTRIES Head Office: 1069 Stote Office Bldg., Portland, Oregon - 97201 Telephone, [503) - 229-5580 FIELD OFFICES 2033 First Street 521 N. E. "E" Street Baker 97814 Grants Pass 97526 xxxxxxxxxxxxxxxxxxxx Subscription Rate 1 year - $2.00; 3 years - $5.00 Available back issues - $.25 eoch Second closs postage paid at Portland, Oregon GOVERNI NG BOARD R. W . deWeese, Portland, Chairman Willian E. Miller, Bend H. lyle Van Gordon, Grants Pass STATE GEOLOGIST R. E. Corcoran GEOlOGISTS IN CHARGE OF FIELD OFFICES Howard C. Brooks, Baker len Ramp, Gronfl Pass Permiuion il gronted to reprint information contained h..... in. Credit given the State of Oregon D~hMnt of Geology and Min.ollndustries for compiling this information will be appreciated. Sio l e of Oregon The ORE BIN DeporlmentofGeology and Minerollndultries Volume 37, No.2 1069 Siole Office Bldg. February 1975 P«tlond Oregon 97201 GEOLOGY OF HUG POINT STATE PARK NORTHERN OREGON COAST Alan R. Niem Deparhnent of Geology, Oregon State University Hug Point State Park is a strikingly scenic beach and recreational area be­ tween Cannon Beach and Arch Cape on the northern coast of Oregon (Fig­ ure 1) . The park is situated just off U.S . Highway 101, 4 miles south of Cannon Beach (Figure 2). It can be reached from Portland via the Sunset Highway (U.S. 26) west toward Seaside, then south. 00 U.S . 101 at Cannon Beach Junction.
    [Show full text]
  • Shipwreck Traditions and Treasure Hunting on Oregon's North Coast
    Portland State University PDXScholar Anthropology Faculty Publications and Presentations Anthropology Summer 2018 The Mountain of a Thousand Holes: Shipwreck Traditions and Treasure Hunting on Oregon's North Coast Cameron La Follette Oregon Coast Alliance Dennis Griffin Oregon State Historic Preservation Office Douglas Deur Portland State University, [email protected] Follow this and additional works at: https://pdxscholar.library.pdx.edu/anth_fac Part of the Archaeological Anthropology Commons, and the Biological and Physical Anthropology Commons Let us know how access to this document benefits ou.y Citation Details Cameron La Follette, Dennis Griffin, & Douglas Deur. (2018). The Mountain of a Thousand Holes: Shipwreck Traditions and Treasure Hunting on Oregon's North Coast. Oregon Historical Quarterly, 119(2), 282-313. This Article is brought to you for free and open access. It has been accepted for inclusion in Anthropology Faculty Publications and Presentations by an authorized administrator of PDXScholar. Please contact us if we can make this document more accessible: [email protected]. The Mountain of a Thousand Holes Shipwreck Traditions and Treasure Hunting on Oregon’s North Coast CAMERON LA FOLLETTE, DENNIS GRIFFIN, AND DOUGLAS DEUR EURO-AMERICANS in coastal communities conflated and amplified Native American oral traditions of shipwrecks in Tillamook County, increasingly focusing the stories on buried treasure. This focus led to a trickle, and then a procession, of treasure-seekers visiting the northern Oregon coast, reach- ing full crescendo by the mid to late twentieth century. The seekers’ theo- ries ranged from the fairly straightforward to the wildly carnivalesque, with many bizarre permutations. Neahkahnie Mountain and its beaches became the premier treasure-hunting sites in Oregon, based on the mountain’s prominence in popular lore, linked to unverified stories about the wreck of a Spanish ship.
    [Show full text]
  • Drainage Basin Morphology in the Central Coast Range of Oregon
    AN ABSTRACT OF THE THESIS OF WENDY ADAMS NIEM for the degree of MASTER OF SCIENCE in GEOGRAPHY presented on July 21, 1976 Title: DRAINAGE BASIN MORPHOLOGY IN THE CENTRAL COAST RANGE OF OREGON Abstract approved: Redacted for privacy Dr. James F. Lahey / The four major streams of the central Coast Range of Oregon are: the westward-flowing Siletz and Yaquina Rivers and the eastward-flowing Luckiamute and Marys Rivers. These fifth- and sixth-order streams conform to the laws of drain- age composition of R. E. Horton. The drainage densities and texture ratios calculated for these streams indicate coarse to medium texture compa- rable to basins in the Carboniferous sandstones of the Appalachian Plateau in Pennsylvania. Little variation in the values of these parameters occurs between basins on igneous rook and basins on sedimentary rock. The length of overland flow ranges from approximately i mile to i mile. Two thousand eight hundred twenty-five to 6,140 square feet are necessary to support one foot of channel in the central Coast Range. Maximum elevation in the area is 4,097 feet at Marys Peak which is the highest point in the Oregon Coast Range. The average elevation of summits in the thesis area is ap- proximately 1500 feet. The calculated relief ratios for the Siletz, Yaquina, Marys, and Luckiamute Rivers are compara- ble to relief ratios of streams on the Gulf and Atlantic coastal plains and on the Appalachian Piedmont. Coast Range streams respond quickly to increased rain- fall, and runoff is rapid. The Siletz has the largest an- nual discharge and the highest sustained discharge during the dry summer months.
    [Show full text]
  • Geologic Formations of Western Oregon
    BULLETIN 70 GEOLOGIC fORMATION§ OF WESTERN OREGON WEST OF LONGITUDE 121° 30' STATE OF OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES 1971 STATE OF OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES 1069 Stal·e Office Building Portland, Oregon 97201 BULLETIN 70 GEOLOGIC FORMATIONS OF WESTERN OREGON (WEST OF LONGITUDE 12 1 °30') By John D. Beaulieu 1971 GOVERNING BOARD Fayette I. Bristol, Rogue River, Chairman R. W. deWeese, Portland Harold Banta, Baker STATE GEOLOGIST R. E. Corcoran CONTENTS Introduction . Acknowledgements 2 Geologic formations 3 Quadrang I es. 53 Corre I ation charts. 60 Bibliography. 63 ii GE OLOGIC FORMA T IONS OF WESTERN OR EGON (W E ST OF LONG ITUD E 12 1°30') By John D. Beaulieu* INTRODUCTION It is the purpose of th is publi cation to provide a concise , yet comprehensive discussion of the for­ mations of western Oregon. It is the further aim that the data for each of the formations be as current as possi ble. Consequently, the emphasis has been placed on th e recent literature . Although this paper should not be viewed as a discussion of the historical development of each of the fo rmations, the original reference for each of the units is given . Also, in cases where the historical development of the formation has a direct bearing on present-day problems it is included in the discussion . A wide variety of published literature and unpublished reports , theses, and dissertations was con­ sul ted and several professional opin ions regarding specific problems were so licited . In recent years re­ search has been concentrated in the Klamath Mountains and the southern Coast Range and for these regions literature was volumi nous.
    [Show full text]
  • Geophysical and Geochemical Analyses of Selected Miocene Coastal Basalt Features, Clatsop County, Oregon
    Portland State University PDXScholar Dissertations and Theses Dissertations and Theses 1980 Geophysical and geochemical analyses of selected Miocene coastal basalt features, Clatsop County, Oregon Virginia Josette Pfaff Portland State University Follow this and additional works at: https://pdxscholar.library.pdx.edu/open_access_etds Part of the Geochemistry Commons, Geophysics and Seismology Commons, and the Stratigraphy Commons Let us know how access to this document benefits ou.y Recommended Citation Pfaff, Virginia Josette, "Geophysical and geochemical analyses of selected Miocene coastal basalt features, Clatsop County, Oregon" (1980). Dissertations and Theses. Paper 3184. https://doi.org/10.15760/etd.3175 This Thesis is brought to you for free and open access. It has been accepted for inclusion in Dissertations and Theses by an authorized administrator of PDXScholar. Please contact us if we can make this document more accessible: [email protected]. AN ABSTRACT OF THE THESIS OF Virginia Josette Pfaff for the Master of Science in Geology presented December 16, 1980. Title: Geophysical and Geochemical Analyses of Selected Miocene Coastal Basalt Features, Clatsop County, Oregon. APPROVED BY MEMBERS OF THE THESIS COMMITTEE: Chairman Gi lTfiert-T. Benson The proximity of Miocene Columbia River basalt flows to "locally erupted" coastal Miocene basalts in northwestern Oregon, and the compelling similarities between the two groups, suggest that the coastal basalts, rather than being locally erupted, may be the westward extension of plateau
    [Show full text]
  • Some Recent Physical Changes of the Oregon Coast
    rOREGON STATE UNIVERS TY LIBRARIES IIIIII 111IIIII1 IIII III 12 0002098016 65458 .8 05 cop .3 FINAL RE PORT (Report on an investigation carried out under Contract Nonr-2771 (04), Project NR 388-062, between the University of Oregon and the Office of Naval Research, U. S. Department of the Navy.) Reproduction in whole or in part is permitted for any purpose of the United States Government. SOME RECENT PHYSICAL CHANGES OF THE OREGON COAST by Samuel N. Dicken assisted by Carl L. Johannessen and Bill Hanneson Department of Geography University of Oregon Eugene, Oregon November 15, 1961 Reprinted in the public interest by the EugeneRegister-Guard and the Lane County Geographical Society,Inc., April, 1976. ACKNOWLEDGEMENTS The subject of coastal changes is of interest to many people living on or near the Oregon coast and, as a result, numerous interviews, only a few of which can be acknowledged, furnished much information not otherwise available. Valuable assistance came from persons concerned professionally with some aspect of coastal change. The staff of the U. S. Army Corps of Engineers, Portland District, was most helpful, especially H. A. Kidby of the Rivers and Harbors Section, Lloyd Ruff of the Geology Section, Mr. Charles Oros of the Photogrammetry Office and Dorothy McKean, Librarian. Mr. E. Olson of the U. S. Coast and Geodetic Survey located copies of old charts and other materials.Ralph Mason of the Oregon State Department of Geology and Mineral Industriescon- tributed notes on Ecola Park and other areas. Robert L. Brown and the staff of the U. S. Soil Conservation Service furnished photographs andspec- ific information on vegetation changes of the dunes.Park Snavely of the U.
    [Show full text]
  • Oregon Department of Transportation (ODOT)
    OREGON INVENTORY OF HISTORIC PROPERTIES SECTION 106 FINDING OF EFFECT FORM Agency/Project: ODOT / US 101 Neahkahnie Rock Wall Repair (Phase 3), Key No. 17886, Federal Aid No. S009(375)PE Property Name: Neahkahnie Mountain Historic District Street Address: Coast Highway/ US 101, Mile Point 40.53-41.07 City, County: Neahkahnie Beach vicinity, Tillamook Preliminary Finding of Effect: No Historic Properties Affected No Historic Properties Adversely Affected Historic Properties Adversely Affected State Historic Preservation Office Comments: Concur Do Not Concur: No Historic Properties Affected No Historic Properties Adversely Affected Historic Properties Adversely Affected Signed _____________________________________________________ Date ______________________________ Comments: Provide written description of the project, and its potential effects on the subject property per 36 CFR 800. Include maps, drawings, and photographs as necessary to effectively describe and discuss the project. Use continuation sheets as needed. Introduction This statement of finding discusses the effect of the proposed Transportation Enhancement Grant-funded rehabilitation project on the eligible Neahkahnie Mountain Historic District (NMHD), in Tillamook County. The Oregon Department of Transportation (ODOT), on behalf of the Federal Highway Administration (FHWA), received concurrence from the State Historic Preservation Office (SHPO) in November, 2008, that the NMHD is eligible for the National Register of Historic Places (NRHP). It is the finding of ODOT, on behalf of FHWA, that the proposed project will have an effect on the National Register eligible NMHD but this effect is “not adverse.” This statement of finding is made pursuant to the requirements of the National Historic Preservation Act of 1966 (36 CFR 800), Executive Order 11593, and the National Environmental Policy Act.
    [Show full text]
  • Geology of Oregon Orr Orr.Pdf
    Fifth Edition Geology of Oregon Elizabeth L. Orr William N. Orr University of Oregon Cover: Ripple-marked sand dunes on the Oregon Coast resemble a gigantic fingerprint (photo by Gary Tepfer). Copyright ® 1964 by Ewart M. Baldwin Copyright ® 1976, 1981, 1992, 2000 by Kendall/Hunt Publishing Company ISBN 0-7872-6608-6 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the copyright owner. Printed in the United States of America 10 98765432 Table of Contents Introduction 1 History of geologic study in Oregon 9 Blue Mountains 21 Klamath Mountains 51 Basin and Range 79 High Lava Plains 103 Deschutes-Columbia Plateau 121 Cascade Mountains 141 Coast Range 167 Willamette Valley 203 Bibliography 223 Glossary 245 Index 251 iii Dedicated to the graduates Acknowledgments Between the fourth and fifth editions of Geology of Oregon, the importance of global tectonics to the state has been ingrained even deeper. Riding on the leading edge of the moving North American plate, Oregon reflects the underlying mecha- nism of the plate collision boundary in virtually all aspects of its geology. In the seven years since the fourth edition was written, an irregular but continuing drumbeat of earthquakes reminds us of the forces beneath our feet and the need to prepare for catastrophic changes be they quakes, volcanoes, tsunamis, floods, or massive earth movements. Most profound is the discovery of irrefutable evidence that these catastrophes have been visited on the state quite regularly over the past few thousands of years as well as the absolute surety that similar disasters will oc- cur in the near and distant future.
    [Show full text]
  • Mt. Pisgah Summer Solstice Hike Upcoming: Sunday, June 20 He Mt
    Volume 81 JUNE 2021 Number 5 Dave Predeek and the Pisgah Native Plant Nursery Joanna Alexander In This Issue ave Predeek opened all the doors of the extensive nursery operation to Dave Predeek/Pisgah Nursery 1 D fellow Obsidians on a fine, cool May morning. Twenty-six straight years of volun- Shiny Geranium 2 teering have passed since Dave started in 1995, when the Native Plant Nursery occu- Willamalane/Obsidian Hiking 3 pied only the 25' x 25' former vegetable garden of the Kienzle farmhouse. The visit Oregon’s Best Views 3 began in the North Trailhead parking lot, where Dave showed native plants installed by the nursery in planters built by Lane County—deer had browsed on the tips of the Personal First Aid Kits 4 young shrubs. We then entered the new winding trail that parallels the river toward the Devil’s Staircase Wilderness Trip 4 nursery, where Dave pointed out cow parsnips, meadow rue, choke cherry, wild cucum- Macduff Mountain Anniversary 5 ber (beware—fatal if consumed as tea!), fringecup, snowberry, osoberry, ninebark, Summer Solstice/Pisgah Pedestal 6 Pacific waterleaf, and delphinium finishing their cobalt blue blossoming. Backpacks & Car Camps 7 Entering the large field where once loud Trip Reports 8–17 gatherings wounded the ears of protesting May Board Notes 18 neighbors, Dave pointed out an unusual Calendar 19 coyote brush shrub standing alone in the field. New Members 19 Tie Trail Closures 19 Approaching the nursery, enclosed in a high fence to keep deer out, violet-green Photo of the Month 20 swallows and hummingbirds sang and swooped.
    [Show full text]
  • Geology of the Green Mountain-Young's River Area, Clatsop County, Northwest Oregon Recicted for Privacy Abstract Approved: (Alan R
    AN ABSTRACT OF THE THESIS OF Carolyn Pugh Peterson for the degree of Master of Science in Geology presented on December 12, 1983 Title: Geology of the Green Mountain-Young's River Area, Clatsop County, Northwest Oregon Recicted for Privacy Abstract Approved: (Alan R. Niem) The upper Eocene to lower Oligocene Oswald West mudstone is the oldest formation (informal) in the Green Mountain-Young's River area. This 1,663 meter thick hemipelagic sequence was depos- ited in a low-energy lower to upper slope environment in the Coast Range forearc basin. The formation ranges from the late Narizian to the early Zemorrian(?) in age and consists of thick-bedded bio- turbated foraminiferal claystone and tuffaceous siltstone. Rare glauconitic sandstone beds also occur. In the eastern part of the study area, the upper part of the Oswald West mudstone is inter- bedded with the upper Refugian Klaskanine siltstone tongue. This informal unit consists of thick bioturbated sandy siltstone and silty sandstone that is a lateral deep-marine correlative of the deltaic to shallow-marine Pittsburg Bluff Formation in the north- eastern Coast Range. Discontinuous underthrusting of the Juan de Fuca oceanic plate at the base of the continental slope of the North American plate caused extensive uplift and subsidence along the Oregon continental margin throughout the Cenozoic (Snavely et al., 1980). Initiation of Oregon Coast Range uplift and accompanying erosion in the early Miocene, coupled with a global low stand of sea level (Vail and Mitchum, 1979), stripped most of the Oligocene (Zemor- rian) Oswald West strata and in places much of the uppermost Eocene (upper Refugian) Oswald West strata in the field area, cre- ating an unconformity.
    [Show full text]
  • Botanizing in the Swala-Lahos Floristic Area
    OREG O N PLANTS , OREG O N PLACES Botanizing in the Swala-lahos Floristic Area Kathleen Sayce PO Box 91, Nahcotta WA 98637 Aerial view of Saddle Mountain from the southeast: note the extensive meadows on the middle and western peaks. The mouth of the Columbia River is in the background, with Clatsop Plains to the left, Astoria to the right, and the south end of the North Beach Peninsula at the top. Photo by Kathleen Sayce with Frank Wolfe as pilot. wala-lahos is the English interpretation of an aboriginal Washington. Bisected by the Columbia River and flanked on name for Saddle Mountain in south central Clatsop County the west by the Pacific Ocean, this is a region of cool, relatively (Giesecke 1991), the site of a Chinook origination story, and rain-free summers and mild, wet winters (Maas 2008, Taylor Sthe legendary home of the Thunderbird. Saddle Mountain rises and Hatton 1999). A climatic mix of summer fog and winter 3,266 feet to three peaks (the saddle), and is the tallest mountain rain supports abundant forest epiphytes. At sea level, three to ten in the Coast Range between the Olympic Mountains and a inches of rain typically fall each month during the wet season; less Miocene basalt plateau in Tillamook County (Niem and Niem than one inch per month in the dry season. Rain-free periods in 1985, Walsh et al. 1987). the summer typically last 30 to 50 days, but may exceed 90 days. The general boundaries of the Swala-lahos Floristic Area (SFA) Annual precipitation increases with elevation: near sea level, 85 to begin on a north line running east in Pacific County, Washington, 90 inches are typical; elevations above 2,000 ft.
    [Show full text]
  • Needs Assessment and System Analysis Report
    Tillamook County, Oregon Public Safety Radio System Needs Assessment and System Analysis Report February 11, 2020 Prepared by: Federal Engineering, Inc. 10560 Arrowhead Dr Fairfax, VA 22030 703-359-8200 Tillamook County, Oregon Needs Assessment and System Analysis Report Executive Summary Tillamook County, Oregon (County) maintains multiple land mobile radio (LMR) systems to meet the specific operational needs of County departments, including Emergency Medical Services (EMS), Fire, Public Works and Sheriff. There are separate channels for Fire/EMS, Public Works and Law Enforcement (Sheriff and local police departments). The LMR channels provide voice communications between radio users in the field and Tillamook County Emergency Communications District (Tillamook 911) dispatchers. A microwave radio and fiber optic backhaul system carries radio user voice signals between the LMR repeater sites and the Tillamook 911 dispatch consoles. Tillamook 911 owns and operates the microwave backhaul system. Tillamook Lightwave, a special district that was set up between the County, Tillamook People’s Utility District (PUD) and the Port of Tillamook Bay, owns and operates the fiber optic system. Most of the LMR and microwave backhaul equipment is at end of the product lifecycle1 and requires replacement. The County is experiencing inadequate radio coverage, as well as system operational and reliability issues. To address these issues, the County contracted with Federal Engineering, Inc. (FE) to assess their existing LMR and microwave radio backhaul systems, identify current and future stakeholder needs and assist in determining the best course of action for the upgrade or replacement of the system. FE completed this report, the Needs Assessment and System Analysis Report, by conducting the following steps: Reviewing system documentation and previous studies Conducting user interviews and gathering data Surveying radio sites Modeling existing system coverage Analyzing existing system attributes vs.
    [Show full text]