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Ammonites in Southern Alaska

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Ammonites in Southern Alaska Stratigraphic Distribution and Zonation of Jurassic (Callovian) Ammonites in Southern Alaska By RALPH W. IMLAY GEOLOGICAL SURVEY PROFESSIONAL PAPER 836 Studies of Callovian ammonites from southern Alaska provide correlations with lower and middle Callovian ammonite zones of Europe UNITED STATES GOVERNMENT PKINTING OFFICE, WASHINGTON : 1975 UNITED STATES DEPARTMENT OF THE INTERIOR STANLEY K. HATHAWAY, Secretary GEOLOGICAL SURVEY V. E. McKelvey, Director Library of Congress Cataloging In Publication Data Imlay, Ralph Willard, 1908- Stratigraphic distribution and zonation of Jurassic (Callovian) ammonites in southern Alaska. (Geological Survey professional paper; 836) Bibliography : p. Includes index. Supt. of Docs. no.: 119.16:836 1. Geology, Stratigraphic--Jurassic. 2. Ammonoidea. 3. Geology--Alaska. I. Title. 11. Series: United States. Geological Survey. Professional paper; 836. QE683.144 564'.5 75-619185 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 Stock Number 024-001-02650-3 CONTENTS Page Abstract - --- - - --- - ---- - - -------- - ---- - - -- -- - -- - - ----- ---- - - -- - - - -------- [ntrodu&ion ---,--------------------------------------------------------- Stratigraphic summary ................................................... Callovian ammonite succession ............................................ West of Cook Inlet .................................................. Talkeetna Mountains ................................................. Alaska Peninsula .................................................... Ammonite zonation ...................................................... Cadoceras (Stenocadoceras) stenoloboide Zone .......................... Cadoceracs catostoma Zone -------------------------------------------& Zniskinites intermedius Subzone ....................................... Ages and correlabions .................................................... Ammonite faunal setting ----------,-------------------------------------- Geographic distribution .................................................. Systematic descriptions .................................................. References cited .................... ---- ,- ----- ........................... Index ----------,-------------------------------------------------------- ILLUSTRATIONS [Plates 1-6 fdow index1 PLATE 1. Kepplerites. 2. Chinitnites. 3. Chinites and Iniskidtea. 4. Zniskinites. 6. Znkkinites and Kepplerites. 6. Parareineckeia and Kepplerites. Page FIGURE 1. correlation chart showing stratigraphic positions of some ammonite localities in the Chinitna Forma- tion west of Cook Inlet .................................................................... - 2. Diagram showing stratigraphic ranges of ammonites in the Chinitna Formation west of Cook Inlet -- 3. Correlation chart showing stratigraphic positions of ammonite localities in the Chinitna Formation in the southeastern part of Talkeetna Mountains ----,----,--,---------------------------------- 4-7. Diagrams showing- 4. Stratigraphic ranges of ammonites in the Chinitna Formation northwest of Limestone Hills in the Talkeetna Mountains .......................................................... 6. Stratigraphic ranges of ammonites in the Chinitna Formation between Limestone Hills and Horn Mountains in the Talkeetna Mountains ........................................ 6. Stratigraphic ranges of ammonites in the Shelikof Formation between Puale Bay and Wide Bay, Alaska Peninsula .............................................................. 7. European and East Greenland ranges of certain ammonites present, or possibly present, in Alaska ............................................................................ 8. Chart showing correlation of Callovian formations and faunas in southern Alaska ------------------- 9. Index map of listed fossil localities in the Chinitna Formation in the Talkeetna Mountains ------------- TABLES Page TABLE1. Some Callovian ammonite genera and species described herein, showing biological relationships and rela- tive numbers available for study ............................................................... 2. Geographic distribution of ammonites in the Chinitna Formation in the Talkeetna Mountains, Alaska --- 3. Descriptions of Jurassic ammonite localities in the Chinitna Formation in the Talkeetna Mountains, Alaska ..................................................................................... STRATIGRAPHIC DISTRIBUTION AND ZONATION OF JURASSIC (CALLOVIAN) AMMONITES IN SOUTHERN ALASKA ABSTRACT I INTRODUCTION Jurassic ammonites of early and middle Callovian Age The Callovian ammonites of southern Alaska de- occur in southern Alaska in the Chinitna and Shelikof scribed by the writer in 1953 have been restudied Formations. Ranges of the ammonite genera and subgenera present, on th,e basis of the stratigraphic distribution of these in order to revaluate the stratigraphic distribution fossils in Eurasia and East Greenland, show that these of the genera and species, to establish ammonite formations should be equivalent te at least the European zones for regional and continental correlations, and zones of Sigaloceras calloviense, Kosmocerm jason, and to date the formations and zones more precisely in Erymnoceras coronatum. Whether the basal few hundred terms of the standard Jurassic zones of western feet of these formations is equivalent to the earliest Callo- vian or to the highest Bathonian, or both, cannot be demon- Europe. This study is based on biostratigraphic data strated for certain. compiled by Detterman and Hartsock (1966, p. 38, Two ammonite zones are recognizable. The upper zone, 39, 44-46, 48) for the Chinitna Formation west of named after Cadoceras (Stenocadocerm) stenoloboic2e (Pom- Cook Inlet and by Arthur Grantz (written commun., peckj), is characterized by an abundance of the subgenus Apr. 1972) for the Chinitna Formation in the Tal- Stenocadoceras. It has been recognized west of Cook Inlet in the Paveloff Siltstone Member of the Chinitna Formation keetna Mountains. These data are much more ac- and in the upper one-sixth of the underlying Tonnie Silt- curate than those available to the writer in 1950. stone Member. In the Talkeetna Mountains it is represented Likewise, study of the many fossil collections made locally near the top of the Chinitna Formation. In the Alaska by Arthur Grantz and associates in the Talkeetna Peninsula it occurs in the middle member of the Shelikof Formation and in the upper fifth of the lower member. Mountains between 1952 and 1963 has provided a The lower ammonite zone, named after Cadoceras catostoma check on conclusions based on data from other areas Pompeckj, is characterized also by the presence of C. gla- concerning ammonite associations, generic and spe- brum Imlay, all species of C. (Paracadoceras), and all cific variations, and stratigraphic distribution. species of Lilloettia except L. stantoni Imlay. These am- The study includes descriptions of two new genera, monites range through the entire lower part of the Chinitna Formation below the beds characterized by C. (Stsnocado- Iniskinites and Chinitnites, that succeed and are ceras) steno~loboide (Pompeckj) and C. (S.) multicostatum closely related to Cranocephalites, a genus of late Imlay. Bajocian (?) to e,arly or middle Bathonian Age. Also, The lower part of the C. aatostoma Zone is herein recog- two specimens of Parareineckeia are illustrated to nized as a submne and is named after the most common show the characteristics of the small septate whorls species, Zniskinites intemnedius (Imlay) . This subzone marks the top of the range of Parareineckeia, of the new genus and of the body chamber of a genus hitherto repre- Zniskinites, and also of Xenocephalites, except for one spxi- sented only by four specimens (Imlay, 195313, p. 101, men. Its lower part includes also all known specimens of pl. 55, fig. 1, 2, 5-8; 1962, p. C25, C26, pl. 7, figs. evolute Kepplerites. Characteristic ammonites of the subzone 1-7). The biological distribution of the described occur in the lower 500 feet of the Chinitna Formation west of Cook Inlet and in the lower half of the lower member of species is shown in table 1. the Shelikof Formation on the Alaska Peninsula. The Callovian ammonites of southern Alaska include some STRATIGRAPHIC SUMMARY genera characteristic of the Boreal realm, such as Keppler- ites, Cadoceras, and Pseudocadoceras, and other genera On the west side of Cook Inlet between Iniskin characteristic of the Pacific realm, such as Xenocephalites, Bay and Tuxedni Bay the Callovian is represented Lilloettia, and Parareineckeia. On the specific level, however, by the Chinitna Formation which, as described by nearly all relationships are southward with Callovian am- Detterman and Hartsock, 1966, p. 40-47), consists monites in British Columbia, Oregon, and northern Cali- fornia. Evidently, southern Alaska during Callovian time of two siltstone members separated by a sandstone was part of a Pacific Coast faunal province. unit 30-200 feet thick. The lower member, named 2 JURASSIC AMMONITE DISTRIBUTION AND ZONATION, SOUTHERN ALASKA TABLE1.--Some Callovian ammonite genera and species de- bearing beds which are older than Callovian and scribed herein, showing biological relationships and relative which correlate faunally with the lower part of the numbers available for study. Bowser Formation west of Cook Inlet (Imlay, 1962, Number of p. C2; Detterman and Hartsock, 1966, p. 35-40). At Famiy Genus and species s~ecimens many
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