OREGON GEOLOGY Published by the Oregon Department of Geology and Mineral Industries

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OREGON GEOLOGY Published by the Oregon Department of Geology and Mineral Industries OREGON GEOLOGY published by the Oregon Department of Geology and Mineral Industries VOLUME 53, NUMBER 4 JULY 1991 In this issue: Field trip guide \0 central Oregon, Pan 2 Geothermal exploration in Oregon, 1990 Cavansite and pentagonite from Lake Owyhee State Park Welded tuffs of the Winberry Creek area Current mineral exploration activity Reclamation awards for 1990 OREGON GEOLOGY OIL AND GAS NEWS (ISSN 0164-3304) Oil and gas leasing activity VOLUME 53, NUMBER 4 JULY 1991 During April, Columbia County held an oil and gas lease sale In januar~. :vtarch. :>.tU). luI). September, and ;-';o\emberby the Oregon Department at which Nehama and Weagant Energy Company of Bakersfield, [ndus!rie~. (Volumes I through ..to ..... ere entitled The Ore Bin.) California, acquired three leases consisting of 677 acres located Governing Board in the Mist Gas Field. All were purchased for $2.50 per acre. Ronald K_ Culbertson, Chair . Myrtle Creek The State of Oregon held an oil and gas lease sale during May, Sidney R. Johnson .. Baker City at which Nehama and Weagant acquired three leases comprising John W_ Stephens .. Portland 897 acres located in Clatsop County, adjacent to the Mist Gas State Geologist . Donald A. Hull Field. All were purchased for $1.00 per acre. The USDA Forest Deputy State Geologist John D. Beaulieu Service plans to hold an oil and gas lease sale for acreage in Publications Manager/Editor . Beverly F. Vogt the Ochoco National Forest in central Oregon. Details can be ob­ Associate Editor . Klaus K.E. Neuendorf tained from Deborah Tout, Ochoco National Forest, P.O. Box 490, Main Office: 910 State Office Building, 1400 SW Fifth Ave., Prineville, Oregon 97754. Portland 97201, phone (503) 229-5580, FAX (503) 229-5639. Baker City Field Office: 1831 First Street, Baker City 97814, phone (503) 523-3133. Howard C. Brooks, Resident Geologist. NWPA annual symposium scheduled Grants Pass Field Office: 5375 Monument Drive, Grants Pass The annual field symposium of the Northwest Petroleum As­ 97526, phone (503) 476-2496. Thomas J. Wiley, Resident Geologist. Mined Land Reclamation Program: 1534 Queen Ave. SE, sociation (NWPA) will be held September 8-\0 and will discuss Albany 97321, phone (503) 967-2039. Gary W. Lynch, Supervisor. the geology and petroleum potential of the Bellingham Basin, north­ western Washington and southwestern British Columbia. The sym­ Second class postage paid at Portland, Oregon. Subscription rates: I year, $8; 3 years, $19. Single issues, $2. Available back posium will include talks and presentations and a day in the field. issues of Ore Bin/Oregon Geology through v. 50, no. 4, $1. Address Contact the NWPA, P.O. Box 6679, Portland, Oregon 97228-6679, subscription orders, renewals, and changes of address to Oregon for further information. Geology, 910 State Office Building, 1400 SW 5th Ave., Portland, OR 9720 I. Permission is granted to reprint information contained Recent permits herein. Credit given to the Oregon Department of Geology and Mineral Industries for compiling this information will be appreciated. POSTMASTER: Send address changes to Oregon Geology, 910 Status, State Office Building, 1400 SW 5th Ave., Portland, OR 97201. Permit Operator, well, proposed total no. API number Location depth (ft) Information for contributors Oregon Geology is designed to reach a wide spectrum of readers 452 Nehama & Weagant SWV4 sec. 35 Permit; interested in the geology and mineral industry of Oregon. Manuscript Columbia Co. 23-35-75 T. 7 N., R 5 W. 3,400. contributions are invited on both technical and general-interest subjects 36-009-00278 Columbia County relating to Oregon geology. Two copies of the manuscript should be submitted, typed double-spaced throughout (including references) and on 453 Nehama & Weagant NEV4 sec. 3 Permit; one side of the paper only. If manuscript was prepared on common word­ Columbia Co. 42-3-65 T. 6 N., R 5 W. 3,300. processing equipment, an ASClI file copy on 5-in. diskette may be submitted 36-009-00279 Columbia County in addition to the paper copies. Graphic illustrations should be camera-ready; photographs should be black-and-white glossies. All figures should be 454 Nehama & Weagant NW'/4 sec. 2 Permit; T. clearly marked, and all figure captions should be typed together on a Columbia Co. 22-2-65 6 N., R 5 W. 3,000. 36-009-00280 Columbia County separate sheet of paper. The style to be followed is generally that of U.S. Geological Survey 455 Nehama & Weagant SWV4 sec. 32 Permit; publications. (See the USGS manual Suggestions to Authors, 6th ed., Columbia Co. 14-32-75 T. 7 N., R 5 W. 3,500. 1978 or recent issues of Oregon Geology.) The bibliography should be 36-009-00281 Columbia County limited to references cited. Authors are responsible for the accuracy of the bibliographic references. Names of reviewers should be included in 456 Nehama & Weagant NEV4 sec. 34 Permit; the acknowledgments. Adams 31-34-75 T. 7 N., R 5 W. 3,600. Authors wilI receive 20 complimentary copies of the issue containing 36-009-00282 Columbia County their contribution. Manuscripts, news, notices, and meeting announcements should be sent to Beverly F. VOg!, Publications Manager, at the Portland 457 Nehama & Weagant SWV4 sec. 31 Application; office of the Oregon Department of Geology and Mineral Industries. Columbia Co. 23-31-65 T. 6 N., R 5 W 2,340. 36-009-00283 Columbia County 458 Nehama & Weagant SEV4 sec. 31 Application; Columbia Co. 34-31-65 T. 6 N., R 5 W. 2,110. 36-009-00284 Columbia County 459 Nehama & Weagant SEV4 sec. 8 Application Columbia Co. 44-8-64 T. 6 N., R 4 W. 1,870 Cover photo 36-009-00285 Columbia County Green calcareous paleosols of the Turtle Cove Member 460 Nehama & Weagant NWV4 sec. 31 Application; of the John Day Formation, Foree Unit, John Day Fossil LF 21-31-65 T. 6 N., R 5 W. 1,950. Beds National Monument. 36-009-00286 Columbia County The area of the John Day Fossil Beds National Monument in Wasco County, Oregon, is a major point of interest in 461 Nehama & Weagant SWV4 sec. 26 Application; the field trip guide beginning on the next page. CER 14-26-64 T. 6 N., R 4 W. 2,850 36-009-00287 Columbia County D 74 OREGON GEOLOGY, VOLUME 53, NUMBER 4, JULY 1991 A field guide to mid-Tertiary paleosols and paleoclimatic changes in the high desert of central Oregon-Part 2 by Gregory 1. Retallack, Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403 This field trip guide was prepared for the Theme Meeting of SEPM (Society for Sedimentary Geology) to be held August 15-18, 1991, in Portland, Oregon. The theme of this meeting is "Continental margins-sedimentation, tectonics, eustasy, and climate." Part I of the guide for the two-day field trip appeared in the last (May 1991) issue of Oregon Geology and ended with the return to John Day to spend the night. This second part presents the guide for the second day and the conclusion of the paper. -Editor EXCURSION ITINERARY FOR SECOND DAY annual range of temperature of 12° to 23°C. Winters may have been consistently snowy by this time. Leave John Day heading west on U.S. Highway 26. The valley About 4 mi west of Dayville on Highway 26, look for and of the John Day River is flanked to the south by Triassic and tum onto an unsealed road leading southwest onto the high terrace. Jurassic schists and to the north by a Miocene and Pliocene se­ quence of white to gray silty claystones and volcanic ashes, within STOP 9. Picture Gorge overlook which the Rattlesnake ash-flow tuff forms a prominent scarp. One-half mile south of U.S. Highway 26 on Day Creek Road, Picture Gorge Basalt in a gorge south of the highway at a point 4 mi west of Dayville (NEV4Nm~ sec. 29, T. 12 S., R. 26 E., 16 mi west of John Day has yielded a K-Ar age of 15.8 m.y. Picture Gorge IS-minute quadrangle), we find a spectacular view (Evernden and others, 1964, corrected by method of Dalrymple, of Picture Gorge and overlying sedimentary rocks (Figure 6). The 1979). The overlying gray to brown, clayey Mascall Formation Gorge itself is formed of tholeiitic flood basalts of the middle is also middle Miocene in age. The prominent rhyodacitic ash-flow Miocene Picture Gorge Basalt of the Columbia River Basalt Group. tuff of the Rattlesnake Formation in this area has a corrected Here the flows dip to the southeast and have been deeply incised radiometric age of 6.6 m.y., so that the tuffaceous sediments en­ by the John Day River, which was an antecedent stream to this closing it are late Miocene and Pliocene in age. This ash-flow tectonic deformation. Although the scene makes a fine photograph, tuff represents a catastrophic volcanic event and is here over this is not the origin of the name Picture Gorge: that name is 100 mi distant from its source in the Harney Basin south of based on the early discovery ofIndian pictographs within the gorge. Bums (Oles and others, 1973). Overlying the basalt with a slight angular discordance is a thick In the river bank near the roadside rest stop that is immediately sequence of gray and brown tuffaceous alluvial sediments of the west of the bridge across the John Day River about II mi west Miocene Mascall Formation. In places, diffuse dark layers of paleo­ of Mount Vernon is a locality for fossil leaves in the middle sols and light-colored, prominently outcropping sandstones of pa­ Miocene Mascall Formation (Chaney, 1948; Chaney and Axelrod, leochannels can be seen.
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