PLIENSBACHIAN (LOWER JURASSIC) BIOSTRATIGRAPHY AND ...

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CONTENTS Abstract/Resume Summary Sommaire Introduction Previous work Acknowledgments Location and regional geology Stratigraphic summary Cold Fish volcanics Spatsizi Group Joan Formation Wolf Den Formation Biochronology Systematic paleontology Measurements and abbreviations Systematic descriptions Family Polymorphitidae Genus U ptonial Genus Dayiceras Genus P olym orphitesl Genus M iltoceras Genus Aeanthopleuroceras Genus Tropidoceras Family Eoderoceratidae Genus Metaderoceras Genus Dubariceras Family Dactylioceratidae Genus Reynesocoeloceras Genus Aveyroniceras Family Oxynoticeratidae Genus Fanninoceras Family Hildoceratidae Genus Leptaleoceras Genus Fuciniceras Genus Arieticeras Genus Canavarial Genus Tiltoniceras Genus Protogrammoceras References Appendix 1: Locality and repository data Appendix 2: Distribution of species at Pliensbachian fossil localities in the Spatsizi area Figures 1. Location map 2. Geological map of northern Stikinia and surrounding terranes 3. Geological map of the northern Spatsizi area 4. Inferred stratigraphic relationships between the Spatsizi Group strata, the Cold Fish volcanics, and other volcanic units in the northern Spatsizi area 5. Distribution of the five formations of the Spatsizi Group in the vicinity of Joan Lake 6. Structural cross-sections 7. Lithostratigraphy and biostratigraphy of Section 1 8. Lithostratigraphy and biostratigraphy of Section 2
12 12 13 14 21 25 26 35 56 9. Lithostratigraphy and biostratigraphy of Section 3 10. Lithostratigraphy and biostratigraphy of Section 4 11. Relative stratigraphic ranges of the Spatsizi area ammonites 12. Fossil localities and measured sections in the Joan Lake map area 13. Semilogarithmic plot of PRHW and UD for Metaderoceras talkeetnaense n. sp. 14. Comparative linear regression data and semilogarithmic plots of PRHW and UD for Dubariceras freboldi, Dubariceras silviesi, and M etaderoceras m outerdei (including M. sp. cf. M . m outerdei) 15. Ornamentation envelopes for species of the genera Dubariceras and M etaderoceras 16. Comparative linear regression data and semilogarithmic plots of PRHW and UD for Leptaleoceras sp. aff. L. accuratum and Arieticeras sp. aff. A . algovianum Plates 1-16. Illustrations of fossils
Page 1 and 2: GEOLOGICAL SURVEY OF CANADA BULLETI
Page 3: PREFACE Study of the copious ammoni
Page 7 and 8: La faune d’ammonites est dominee
Page 9 and 10: INTRODUCTION The northern part of t
Page 11 and 12: Figure 4. Inferred stratigraphic re
Page 13 and 14: Figure 5. Distribution o f the fiv
Page 15 and 16: SOUTHWEST A Metres 2500 2000 1500 1
Page 17 and 18: SECTION 3 3 km southw est of Joan L
Page 19 and 20: Figure 12. Fossil localities and me
Page 21 and 22: D escription. Shell midvolute, whor
Page 23 and 24: fragments at which stage the whorl
Page 25 and 26: Material. A single, large whorl fra
Page 27 and 28: talkeetnaense is known from the Fre
Page 29 and 30: where they trend rursiradiately, th
Page 31 and 32: 40 35 30 25 20 15 10 35 30 25 20 15
Page 33 and 34: 1984 Dubariceras fre b o ld i Domme
Page 35 and 36: Family DACTYLIOCERATIDE Hyatt, 1867
Page 37 and 38: that bear only sporadic tubercles.
Page 39 and 40: Type species. Leptaleoceras leptum
Page 41 and 42: Discussion. Specimen is considered
Page 43 and 44: North America is poorly documented.
Page 45 and 46: Genus and species indet. Plate 16,
Page 47 and 48: Callomon, J.H. 1984: Biostratigraph
Page 49 and 50: Hallam, A. 1988: A re-evaluation of
Page 51 and 52: 1862: U b e r J u ra s s is c h e n
Page 53: Taylor, D.G., Smith, P.L., Laws, R.
Page 56 and 57:
Locality Field no. GSC loc. no. GSC
Page 58 and 59:
West end o f anticline The followin
Page 60 and 61:
F F F F F F K K F K ? ? C K K F F F
Page 63:
Figure 1. Camptonectes (Camptochlam
Page 67:
Figures 1, 2. U ptonial sp. 1. Figu
Page 71:
Figures 1-5. M etaderoceras talkeet
Page 75:
Figures 1-4. M etaderoceras sp. cf.
Page 79:
Figures 1-4. M iltoceras sp. 1. Fig
Page 83:
Figures 1-7. Arieticeras sp. aff. A
Page 87:
Figure 1. Genus and species indet.
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PLIENSBACHIAN (LOWER JURASSIC) BIOSTRATIGRAPHY AND ...

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