Jurassic (Bathonian and Gallovian) Ammonites in Eastern Oregon and Western Idaho GIOXOOICAL JSURVIY PROFESSIONAL PAPER Jurassic (Bathonian and Callovian) Ammonites in Eastern Oregon and Western Idaho By RALPH W. IMLAY GEOLOGICAL SURVEY PROFESSIONAL PAPER 1142 The late Bathonian to middle Callovian ammonite succession in eastern Oregon is remarkably similar to that in southern Alaska UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1981 UNITED STATES DEPARTMENT OF THE INTERIOR CECIL D. ANDRUS, Secretary GEOLOGICAL SURVEY H. William Menard, Director Library of Congress Cataloging in Publication Data Imlay, Ralph Willard, 1908- Jurassic (Bathonian and Callovian) ammonites in eastern Oregon and western Idaho. (Geological Survey professional paper; 1142) Bibliography: p. Includes index. 1. Ammonoidea. 2. Paleontology-Jurassic. 3. Paleontology-Oregon. 4. Paleontology-Idaho. I. Title. II. Series: United States. Geological Survey. Professional paper; 1142. QE807.A5159 564'.53 79-13537. For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 CONTENTS Page Abstract ________________________________________________ 1 Introduction ______________________________________________ 1 Biologic analysis ___________________________________________ 2 Stratigraphic summary _______________________________________ 3 East-central Oregon _______________________________________ 3 Snake River Canyon area in Idaho and Oregon ________________________ 7 Ages and correlations ________________________________________ 7 Snowshoe Formation in east-central Oregon _________________________ 7 Trowbridge Shale in east-central Oregon ___________________________ 11 Lonesome Formation in east-central Oregon _________________________ 11 Jurassic beds near Mineral, western Idaho __________________________ 12 Jurassic beds near Pittsburg Landing in northeast Oregon _________________ 12 Ammonite faunal setting _______________________________________ 12 Geographic distribution ________________________________________ 13 Systematic descriptions _______________________________________ 17 References cited _________________________________________ 21 Index _________________________________________________ 23 ILLUSTRATIONS [Plates follow index] PLATE 1. Parapatoceras, Bullatimorphites, Xenocephalites, Iniskinites, and Lilloettia. 2. Kepplerites, Pseudocadoceras, and Choffatial 3. Torricelliceras. 4. Iniskinites. 5. Cobbanites and Grossouvria. Page FIGURES 1-4. Index maps showing: 1. General areas in which Bathonian and (or) Callovian ammonites occur in eastern Oregon and westernmost Idaho __ 2 2. Bathonian and Callovian ammonite areas in the Suplee-Izee-Seneca region, east-central Oregon ____________ 3 3. Bathonian and Callovian USGS Mesozoic localities from which ammonites were collected in the Izee area, east-central Oregon ____________________________________________________________ 4 4. Bathonian (?) and Callovian ammonite localities near Mineral (abandoned), western Idaho ________________ 5 5. Correlation of some Middle Jurassic (Bathonian and Callovian) formations and faunas in eastern Oregon and southern Alaska ________________________________________________________________ 6 6. Stratigraphic ranges of late Bathonian to middle Callovian ammonites in the Suplee-Izee-Seneca region, east-central Oregon _______________________________________________________________ 8 TABLES Page TABLE 1. Ammonite genera of Bathonian and Callovian Age in eastern Oregon and western Idaho ___________________ 2 2. Thicknesses of the Trowbridge Shale in east-central Oregon ____________________________________ 5 3. Stratigraphic positions of Bathonian ammonites in the upper part of the upper member of the Snowshoe Formation, Izee area, Grant County, east-central Oregon __________________________________________ 9 4. Geographic distribution of Bathonian ammonites in the Izee area, Grant County, east-central Oregon ____________ 9 5. Geographic distribution of Callovian or possible Callovian ammonites in eastern Oregon and western Idaho _________ 12 6. Description of Bathonian and Callovian ammonite localities in east-central Oregon and westernmost Idaho _________ 13 in CONVERSION FACTORS Metric unit Inch-Pound equivalent Metric unit Inch-Pound equivalent Length Specific combinations Continued millimeter (mm) = 0.031937 inch (in) liter per second (L/s) = .0353 cubic foot per second meter ( m ) = 3.28 feet (ft) cubic meter per second = 91.47 cubic feet per second per kilometer (km) = .62 mile (mi) per square kilometer square mile [ (ft3/s)/mi2] [(m3/s)/km2 ] meter per day (m/d) = 3.28 feet per day (hydraulic Area conductivity) (ft/d) square meter (m-) = 10.76 square feet (ft2 ) meter per kilometer = 5.28 feet per mile (ft/mi) square kilometer (km2 ) = .386 square mile (mi2 ) (m/km) hectare (ha) = 2.47 acres kilometer per hour .9113 foot per second (ft/s) Volume (km/h) meter per second (m/s) 3.28 feet per second cubic centimeter (cm3 ) = 0.061 cubic inch (in3 ) meter squared per day = 10.764 feet squared per day (ft2/d) liter (L) = 61.03 cubic inches (mVd) ( transmissivity ) cubic meter (m3 ) = 35.31 cubic feet (ft3 ) cubic meter per second = 22.826 million gallons per day cubic meter = .00081 acre-foot (acre-ft) (mVs) (Mgal/d) cubic hectometer (hm3 ) = 810.7 acre-feet liter = 2.113 pints (pt) cubic meter per minute = 264.2 gallons per minute (gal/min) liter = 1.06 quarts (qt) (ni3/min) liter = .26 gallon (gal) liter per second (L/s) = 15.85 gallons per minute cubic meter = .00026 million gallons (Mgal or liter per second per = 4.83 gallons per minute per foot 10" gal) meter [<L/s)/m] [(gal/min) /ft] cubic meter = 6.290 barrels (bnl) (1 bbl = 42 gal) kilometer per hour .62 mile per hour (mi/h) Weight (km/h) meter per second (m/s) gram (g) = 0.035 ounce, avoirdupois (oz avdp) gram per cubic = 62.43 pounds per cubic foot (lb/ft3) gram = .0022 pound, avoirdupois <lb avdp) centimeter (g/cm3 ) metric tons (t) = 1.102 tons, short (2,000 Ib) gram per square = 2.048 pounds per square foot (lb/ft2 ) metric tons = 0.9842 ton, long (2,240 Ib) centimeter (g/cm2) gram per square = .0142 pound per square inch (lb/in2 ) Specific combinations centimeter kilogram per square _ 0.96 atmosphere (atm) centimeter (kg/cm2 ) Temperature kilogram per square centimeter degree Celsius (°C) = 1.8 degrees Fahrenheit (°F) cubic meter per second = 33.3 cubic feet per second (ft3/s) degrees Celsius = rU.SX°C)+32] degrees Fahrenheit ( m;>/s > (temperature) JURASSIC (BATHONIAN AND CALLOVIAN) AMMONITES IN EASTERN OREGON AND WESTERN IDAHO By RALPH W. IMLAY ABSTRACT tion; (2) Lilloettia at one locality about 1,250 feet (381 m) above the Jurassic ammonites of late Bathonian to middle Callovian Age have base of the formation; (3) Pseudocadoceras grevringki (Pompeckj) been found in 12,000-13,000 feet (3,660-3,960 m) of strata exposed in throughout the upper half of the formation; and (4) Pseudocadoceras the area near and south of Izee and Seneca in east-central Oregon. Am­ cf. P. grewingki throughout nearly all the formation. In comparison monites of early Callovian Age and possibly also late Bathonian Age with beds containing the ammonite sequence in southern Alaska, the occur in several hundred feet of black shale exposed along Dennett beds in the Lonesome Formation that contain Xenocephalites and Creek near Mineral, Idaho. Early Callovian ammonites also occur in Lilloettia cannot be younger than the middle part of the Paveloff similar black shale exposed on the Oregon side of Snake River Canyon Siltstone Member of the Chinitna Formation, which part is of early about 32 miles (52 km) south of the northeast corner of Oregon. middle Callovian Age. The beds containing Pseudocadoceras, however, The late Bathonian near Izee, Oreg., is represented in the upper 700 could represent any part of the Callovian above the basal zone of feet (213 m) of the Snowshoe Formation by an association of the am­ Macrocephalites macrocephalus. Consideration of both stratigraphic monites Bullatimorphites, Xenocephalites, Kepplerites, Tor- and faunal evidence shows that the Lonesome Formation is approx­ ricelliceras, Iniskinites, Parareineckeia, Cobbanites, and Choffatia. imately equivalent to the Paveloff Siltstone Member and is mostly of Such as association also occurs west of Cook Inlet, Alaska, in the upper middle Callovian Age, but its basal part must be of late early Callovian few hundred feet of the Bowser Formation; this upper part is dated as Age and is probably equivalent to the highest part of the Tonnie late Bathonian by one occurrence of the Bathonian genus Cobbanites Siltstone Member of the Chinitna Formation. only 100 feet (30 m) below an occurrence of Kepplerites, a genus not known below the upper Bathonian. The late Bathonian is also possibly INTRODUCTION represented near Mineral, Idaho, by an immature ammonite assigned to Cobbanites. Some of the ammonites described herein as of late The early Callovian near Izee, Oreg., is represented from 1,000 to Bathonian to middle Callovian Age were described by 1,500 feet (305 to 458 m) above the base of the Trowbridge Shale by an the writer in 1964 as entirely of early Callovian Age. association of the ammonites Xenocephalites vicarius Imlay, Lilloettia buckmani (Crickmay), L. stantoni Imlay, and Kepplerites. It is After the publication of the 1964 report, many am­ represented in the Mineral area of Idaho by the same genera and most monites were collected by H. J. Buddenhagen in 1967; of the same species, and it is represented on the Oregon side of