The Kimmeridgian ammonite faunas of Milne Land, central East Greenland by Tove Birkelund and John H. Callornon CONTENTS Introduction 5 Lithostratigraphy . 6 Ammonitezonation . 11 Systematic description of ammonites 12 Family Cardioceratidae Siemiradzki. 1891 12 Genus Amoeboceras Hyatt. 1912 . 12 SubgenusAmoebitesBuckman. 1925 12 Amoeboceras (Amoebites) bayi sp . nov 13 Amoeboceras (Amoebites) sp. aff . A.(A.) schulginae Mesezhnikov, 1967 . 18 Amoeboceras (Amoebites) cf . A . (A.) ernesti (Fischer, 1913) 18 Amoeboceras (Amoebites) subkitchini Spath, 1935 19 Amoeboceras (Amoebites) cf . A . (A.) beaugrandi (Sauvage, 1871) . 23 Amoeboceras (Amoebites) elegans Spath. 1935 24 Subgenus Euprionocerm Spath. 1935 26 Amoeboceras (Euprionoceras) kochi Spath. 1935 . 26 Subgenus Hoplocardioceras Spath. 1935 . 28 Amoeboceras (Hoplocardioceras) decipiens Spath. 1935 28 Family Aulacostephanidae Spath. 1924 29 Genus Pictonia Bayle. 1878 29 Pictonia sp. nov . A aff . P. normandiana Tornquist 30 Pictonia? sp . indet . B . 32 Genus Rasenia Salfeld, 1913 . 33 Rasenia inconstans Spath, 1935 . 33 Rasenia cymodoce (dlOrbigny. 1850) 35 Rasenia evoluta Spath. 1935 36 Rasenia borealis Spath. 1935 . 38 Genus ?Pachypictonia Schneid. 1940 40 ?Pachypictonia sp . nov . C . 40 Genus Aulacostephanoides Schindewolf. 1925 42 Aulacostephanoides mutabilk (Sowerby. 1823) 42 Genus Aulacostephanus Tornquist. 1896 . 44 Aulacostephanus eudoxur (d'orbigny. 1850) 44 Aulacostephanus sp. cf . or aff . A u. kirghisemis (d'orbigny, 1845) 45 Family Oppeliidae Douville. 1890 . 46 Genus Streblites Hyatt. 1946? 46 Streblites? cf . S . taimyrenris Mesezhnikov. 1976 . 46 Appendix 48 Acknowledgements . 53 References . 54 INTRODUCTION The Upper Jurassic deposits of Milne Land lie in a key area for Jurassic Boreal ammonite stratigraphy. Early collections brought back to Copenhagen by Rosenkrantz (1929) and Aldinger (1935) were described in two classical monographs by Spath (1935, 1936), and all these works continue to form the basis for subsequent stratigraphical and palaeontological revisions. Since then extensive field work and collecting have yielded important new material and much more detailed stratigraphical information (Callomon, 1961; Hikansson et al., 1971; Birkelund et al., 1978a; Higgins & Hikansson, 1980; Birkelund, Callomon & Fiirsich, 1984). The biostratigraphy of the ammonites in particular has revealed a rich succession that can be used to provide close chronostratigraphic control. Some 48 ammonite faunas range from Boreal Upper Bathonian (Middle Jurassic) resting on crystalline basement to Valanginian (Lower Cretaceous). Of these, faunas 1-19 were summarized previously (Callomon & Birkelund, 1980), and the descriptions of the ammonites given there and in Sykes & Callomon (1979) leave little to add up to and including the Upper Oxfordian , faunas 1-13. Faunas 24-48, covering Lower Volgian, Middle Volgian and Lower Valanginian, were also described previously (Callomon & Birkelund, 1982). In the present work we describe the succession through the Kimmeridgian, used in the international sense (Lower Kimmeridgian sensu anglico). This covers faunas 14-23 (table 1). The choice is largely one of convenience, for the faunas in this range coincide roughly with the material treated in Spath's first monograph (1935), are bounded by a sharp fauna1 change at the top, and consist of a closely circumscribed group of forms belonging almost wholly to only two families, the Cardioceratidae and Aulacostephanidae. The area from which the material came is shown on the map (fig. 1). It was collected bed by bed in about half of the total of some 50 or so recorded sections, the detailed descriptions of which are deposited together with the collections in the Geological Museum of the University of Copenhagen.