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Oregon Geology ORECiON CiEOLOCiY published by the Oregon Department of Geology and Mineral Industries VOLUME 44 , NUMBER 5 MAY 1982 OREGON GEOLOGY OIL AND GAS NEWS (ISSN 0164-3304) Columbia County: Reichhold Energy Corporation continues to carry out ex­ VOLUME 44, NUMBER 5 MAY 1982 ploratory drilling in Columbia County, most recently spudding Crown Zellerbach 32-26 about 11 mi southeast of production Published monthly by the State of Oregon Department of Geology and Mineral Industries (Volumes 1 through 40 were en­ at the Mist Field. This well, projected for 6,500 ft, is located in titled The Ore Bin). sec. 26, T. 5 N., R. 4 W. The company also anticipates redrilling two existing wells at Mist: Columbia County 4 and 13-1. Governing Board C. Stanley Rasmussen . .. Baker Douglas County: Allen P. Stinchfield ........................ North Bend Florida Exploration Company of Houston has begun Donald A. Haagensen ....................... " Portland drilling northwest of Roseburg in Douglas County. A Mont­ State Geologist. .. Donald A. Hull gomery rig from California spudded the well, Florida Explora­ tion Company 1-4, on April 6 and is drilling toward a pro­ Deputy State Geologist ..................... John D. Beaulieu posed depth of 10,000 ft. The well is in sec. 4, T. 21 S., R. 6 W. The operator has also applied to drill a second well in Editor ................................... Beverly F. Vogt Douglas County (see table below). Main Office: 1005 State Office Building, Portland 97201, phone Malheur County: (503) 229-5580. It has been over 20 years since an oil and gas well has been drilled in northern Malheur County, although several of the Baker Field Office: 2033 First Street, Baker 97814, phone (503) earlier wells had shows of gas. Z & S Construction Company 523-3133. Howard C. Brooks, Resident Geologist of Kimball, Nebraska, will soon bring the oil and gas search back to the Vale area with a well to be drilled in sec. 9, Grants Pass Field Office: 312 S.E. "H" Street, Grants Pass 97526, T. I9S., R. 44 E. The proposed depth is 4,850 ft. phone (503) 476-2496. Len Ramp, Resident Geologist Recent permits: Mined Land Reclamation Program: 1129 S.E. Santiam Road, Permit Operator, Albany 97321, phone (503) 967-2039. no. well, API Location Status Paul F. Lawson, Supervisor 210 Reichhold Energy SE\I.i sec. 26 Permit Subscription rates: I year, $4.00; 3 years, $10.00. Single issues, Crown Zellerbach 34-26 T. 5 N., R. 4 W. issued $.40 at counter, $.75 mailed. 009-00101 Columbia County Available back issues of The Ore Bin: $.25 at counter, $.75 211 Reichhold Energy NE\I.i sec. 26 Spud mailed. Crown Zellerbach 32-26 T. 5 N., R. 4 W. 3/26/82 009-00102 Columbia County Address subscription orders, renewals, and changes of address 212 Z & S Construction SE \I.i sec. 9 Application to Oregon Geology, 1005 State Office Building, Portland, OR Recla 1 T. 19 S., R. 44 E. 97201. 045-00023 Malheur County Florida Exploration Co. NW \I.i sec. 25 Application Send news, notices, meeting announcements, articles for publi­ 213 T. 24 S., R. 8 W. cation, and editorial correspondence to the editor, Portland of­ USA 1-25 019-00015 Douglas County fice. The Department encourages author-initiated peer review for technical articles prior to submission. Any review should be D noted in the acknowledgments. Permission is granted to reprint information contained herein. Credit given to the Oregon Department of Geology and Mineral Industries for compiling this information will be appreciated. CONTENTS Jurassic shallow marine invertebrate depth zones, Second class postage paid at Portland, Oregon. with exemplification from the Snowshoe Formation, Postmaster: Send address changes to Oregon Geology, 1005 Oregon ........................................... 51 State Office Building, Portland, OR 97201. USGS publishes book on 1980 eruptions of Mount St. Helens. .. 57 Help us save! ....................................... 57 A revision to the estimate of the geothermal potential of Newberry Volcano ...................... 57 Student AIME group forms at PSU .................... 57 COVER PHOTO An example of the ammonite genus Euhop/oceras USGS lists early signs of possible landslides .............. 58 from the Snowshoe Formation in the Suplee area, east­ Meeting announcements .............................. 58 central Oregon. Maximum diameter of specimen is Brownfield enters private sector ....................... 58 13.5 cm. See article beginning on next page. 50 OREGON GEOLOGY, VOL. 44, NO.5, MAY 1982 Jurassic shallow marine invertebrate depth zones, with exemplification from the Snowshoe Formation, Oregon by David G. Taylor, Earth Sciences Department, Portland State University, Portland, Oregon 97207 INTRODUCTION stratigraphic context provide the basis for a model of the The Jurassic System historically has been associated with shallow marine depth zonation. Comparison of the faunas the development of concepts important for paleontology. Its from the Western Cordillera, Western Interior, and Europe classic terrane, in Europe, was the proving ground for such demonstrates the applicability of the zonation over wide areas principles as faunal succession (William Smith), refined faunal and in the disparate settings of the eugeosynclinal and epeiric zonation (Albert Oppel) and stages (Alcide d'Orbigny), and environments. This suggests that the nearshore to offshore for the conceptualization of facies (Armanz Gressly). Jurassic distributional pattern of the invertebrate fauna documented molluscan-dominated shelly faunas have been the source of a initially in Oregon provides a model of general significance for profusion of monographs and even some detailed paleoeco­ the Jurassic. logic studies. Yet, to this day we have no comprehensive model The zones may be recognized by characteristic, depth­ for the shelly invertebrate depth zonation in the Jurassic related clusters of paleocommunities or by unique co­ shallow marine environment. Provinciality in the Jurassic was occurrences and relative abundances of taxa (Figures 3 and 4). modest, which suggests that we may seek a general model of Boucot (1975) applied the term "benthic assemblage" the paleobathymetric faunal distribution, just as has been ac­ ( = marine benthic life zone of Berry and Boucot, 1971, 1972) complished for parts of the Paleozoic (Berry and Boucot, to groups of benthonic communities that are depth related. 1972; Boucot, 1975). Boucot (1975) also suggested the use of parallel sets of Our accumulated knowledge of Jurassic paleontology planktonic assemblages where appropriate. To facilitate a centers on Europe. It is the only region where marine inverte­ holistic approach, the term "composite assemblage" is pro­ brate faunas are well known and, with a few exceptions, is the posed here for depth-related faunal associations and combina­ source for detailed paleoecologic study. Our knowledge of the tions of taxa encompassing all preserved fauna. In the defini­ Jurassic is weighted heavily toward the epeiric environment, tion of the composite assemblage, emphasis is placed on the which typifies northwest Europe. bathymetric overlap in diversity and abundance of higher The Jurassic of the Western Cordillera of the United (supra-familial) taxa and certain ecologic groups (e.g., ben­ States consists of thick eugeosynclinal sequences that have thonic, nektonic, and planktonic taxa), because these are ex­ received comparatively little study paleontologically, with the pected to retain a relatively stable arrangement, both tem­ notable exception of the numerous articles by Imlay (1980, for porally and geographically. summary). The neglect may have resulted partly from the belief by many that eugeosynclinal terranes are unsuited for refined paleontologic work. This attitude is best exemplified in the statement of a prominent Jurassic stratigrapher contrasting the Jurassic in the Western Interior with the West Coast se­ quences: "The facts attest conclusively to an environment of low topographic relief and considerable tectonic stability [in the Western Interior], in sharp contrast to the situation in California and neighboring states, where distinguishable rock formations cannot be traced over any great distance, and the great sedimentary thicknesses, poor fossil content and subse­ quent tectonic complications combine to rule out fine WADE BUTTE 44·00' -il stratigraphic analysis" (Hallam, 1975, p. 123). Volcaniclastic sequences are, in fact, prime subjects for cf:f-------_ conducting refined stratigraphic and paleontologic studies. Because such strata characteristically display rapid lithofacies changes, a wide spectrum of onshore to offshore depositional BIG MOWICH environments and accompanying faunal trends may be traced '. '. MOUNTAIN along coeval strata over distances of just a few kilometers. These rocks also are typified by numerous tuff beds, and where tuff-bed sequences and ammonite successions can be in­ terrelated, precise correlation is the rule. Detailed, strati­ graphically based studies in such rocks, therefore, potentially are amenable to exceptionally refined basinal analysis. The Snowshoe Formation in the Suplee area is a case in point (Fig­ ures 1 and 2) (Taylor, 1977, 1981). Figure 1. Location map showing distribution oj Snow­ The study of the Snowshoe Formation reveals a full range shoe Formation (stippled) in the Suplee area. Numbers along of inferred intertidal to basinal paleocommunities (studied transect (dashed line) indicate locations oj stratigraphic quantitatively by this author, 1981), which in their sections. OREGON
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