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A Basal Oligocene Local Fauna from Mccarty's Mountain Southwestern Montana

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A Basal Oligocene Local Fauna from Mccarty's Mountain Southwestern Montana University of Montana ScholarWorks at University of Montana Graduate Student Theses, Dissertations, & Professional Papers Graduate School 1963 A basal Oligocene local fauna from McCarty's Mountain southwestern Montana Stanley Joseph Riel The University of Montana Follow this and additional works at: https://scholarworks.umt.edu/etd Let us know how access to this document benefits ou.y Recommended Citation Riel, Stanley Joseph, "A basal Oligocene local fauna from McCarty's Mountain southwestern Montana" (1963). Graduate Student Theses, Dissertations, & Professional Papers. 7142. https://scholarworks.umt.edu/etd/7142 This Thesis is brought to you for free and open access by the Graduate School at ScholarWorks at University of Montana. It has been accepted for inclusion in Graduate Student Theses, Dissertations, & Professional Papers by an authorized administrator of ScholarWorks at University of Montana. For more information, please contact [email protected]. A BASAL OLIGOCENE LOCAL FAUNA FROM McCARTY'S MOUNTAIN, SOUTHWESTERN MONTANA by STANLEY J. RIEL B. A. UNIVERSITY OF NEW HAMPSHIRE, 1961 Presented in partial fulfillm ent of the requirements for the degree of Master of Science M ONTANA STATE UNIVERSITY 1963 Approved by: 7 \ 7 . y j Chairman, Board of Examiners Dean, Graduate School DEC 763 Date UMI Number: EP37943 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. UMT Dissarlâtion Publishing UMI EP37943 Published by ProQuest LLC (2013). Copyright in the Dissertation held by the Author. Microform Edition © ProQuest LLC. All rights reserved. This work is protected against unauthorized copying under Title 17, United States Code ProQuest ProQuest LLC. 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, Ml 48106- 1346 TABLE OF CONTENTS Page ABSTRACT............................................................................................................... v ii INTRODUCTION ................................................................................................. I HISTORICAL R E V IE W ................................................................................... 1 LOCATION ...................................................................................................... 4 PRESENT S T U D Y ............................................................................................. 5 ACKNOWLEDGEMENTS............................................................................. 6 GEOLOGY ........................................................................................................... 7 GENERAL FEATURES.................................................. 7 LOWER OLIGOCENE FOSSIL B E D S........................................................... 10 S tr u c t u r e ................................................................................................. 10 Stratigraphy ............................................................................................. I I Environment of D eposition .................................................................... 16 FAUNAL CENSUS AND CO RRELATIO N.......................................................... 20 PALEOECOLOGY.................................................................................................. 25 DESCRIPTION OF F A U N A ................................................................................... 28 MARSUPIALIÂ.................................................................................................. 28 Peratherium titanelix? M atthew ........................................................... 28 INSECTIVORA................................................................................................. 28 Ictops acutidens Douglass ..................................................................... 28 11 TABLE OF CONTENTS (Continued) Page R O D E N T IA ....................................................................................................... 31 Ischyromys pliocus T r o x e ll .................................................................... 31 Cylindrodcn fontis Douglass ............................................................... 35 Cyllndrodoti aff. fontis D ouglass ...................................................... 35 Pseudocylindrodon aff. médius B u rk e ................................................. 38 Ardynomys occidental is B u rk e .......................................................... 41 Ardynomys? ,ccidentalis Burke .......................................................... 43 Protoptychus? sp........................................................................................ 44 Paradjidaumc minor D ouglass ............................................................... 44 LAGOMORPHA............................................................................................. 44 Paleolagus temnodon D o u g la s s ........................................................... 44 CARNIVORA ................................................................................................... 45 Parictis cf. dokotensis C la r k ................................................................ 45 PERISSODACTYLA......................................................................................... 46 Mesohippus sp ............................................................................................. 46 Colodon? cingulatus Douglass ............................................................ 46 Colodon cf. kayi H ough ...................................................................... 47 Helaletidae? ............................................................................................ 48 Caenopus s p . ............................................................................................ 48 Subhyracodon? sp ....................................................................................... 50 111 TABLE OF CONTENTS (Continued) Page Rhlnocerotoidea gen. and sp. indet .................................................... 51 Brontotheriidae ...............................................................................................51 ARTIODACTYLA...................................................................................................51 Ore one tes anceps Douglass ......................................................................52 Limnetes platyceps D o u g la s s .......................................................................57 Leptomeryx cf. black! Stock .......................................................................59 Leptomeryx cf. minutus Peterson ................................................................ 61 Artiodactylo Incertae sedis ........................................................................... 62 REFERENCES............................................................................................................... 64 IV LIST OF ILLUSTRATIONS Figure Paye 1. Index map of McCart/'s Mountain vertebrate fossil localities . 2 2. Panorama of the south side of McCarty's M o u n ta in ............................ 3 3. Pliocene? pediment gravels unconformably overly:, j the sedimentary t u f f .......................................................................................... 9 4. Nodules In the sedimentary t u f f ............................................................. 13 5. Blocky weathering of sedimentary tu ff ................................................... 13 6. Red-weathering andésite sill directly north of the main locality . 14 7. Stream channel within sedimentary tuff sequence ............................... 14 8. Red-weathering andésite boulders in a channel ................................. 14 9. Tooth nomenclature used In description of cylindrodont rodents . 33 Table 1. Iron content of sedimentary tuff in p e rc e n t ........................................ 16 2. Faunal census with specimen numbers ................................... 21 3. Comparative lists of Lower Oligocene faunas from Southwestern . M o n ta n o ..................................................................................................... 24 4. Measurements - Ictops a c u tid e n s ........................................................ 30 5. Measurements - Cylindrodon fontis and C. off, f o n t is .................... 37 6. Measurements - Pseudocy lindrodon aff. m e d iu s ............................... 40 7. Measurements - Ardynomys o c c ld e n ta lis ............................................. 43 LIST OF ILLUSTRATIONS (Continued) Table Page 8. Measurements - C o lo d o n ....................................................................... 48 9, Measurements - Caenopus sp ................................................................... 49 10. Measurements - Oreonetes a n c e p s ......................................................... 55 11. Measurements Limnetes p la ty c e p s ...................................................... 58 12. Measurements - Leptomeryx cf. b la c k i ................................................. 60 13. Measurements - Leptomeryx minutus and L. cf. m in u tu s .......................... 62 Plate 1. Geologic mop of McCarty's Mountain area (in folder) 2. Stratigraphie location of fossils from McCarty's Mountain main lo c a lit y .................................................................................................(in
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