Geological Survey of Denmark and Greenland Bulletin 34

Publiceret 31-01-2016

The ammonites of the Middle Jurassic
Cranocephalites
beds of East Greenland by J.H. Callomon, P. Alsen & F. Surlyk.

The Mesozoic sedimentary succession of eastern Greenland is renowned for its Boreal Jurassic ammonite record. The marine Middle Jurassic deposits of the Jameson Land Basin in central East Greenland are particularly rich in ammonites and have been the subject of much detailed taxonomic and stratigraphic study since the first collections at the beginning of the 20th century. Over the last fifty years, much of the work on the Middle Jurassic ammonite faunas has been undertaken by John H. Callomon, working initially under Lauge Koch's last expeditions and subsequently with the University of Copenhagen and the Geological Survey of Greenland (GGU, now GEUS).

This bulletin presents the culmination of these endeavours, published after John H. Callomon's death. It focusses on the so-called Cranocephalites beds of the Ugleelv area of Jameson Land where a detailed ammonite stratigraphy comprising thirty-four faunal horizons is established for the Borealis, Indistinctus and Pompeckji Standard Zones. The Pompeckji Zone is subdivided into four new subzones and four new species are described. This detailed taxonomic and stratigraphic analysis confirms the status of the Jameson Land succession as the key Boreal reference section for this time interval, and furthermore allows a high-resolution study of the evolution of the ammonites which on this time-scale appears to be continuous.

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The ammonites of the Middle Jurassic Cranocephalites beds of East Greenland

The printed version of Geological Survey of Denmark and Greenland Bulletin 34 will soon be available from:
Geological Survey of Denmark and Greenland
Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
Phone: +45 38 14 20 00, fax: +45 38 14 20 50, e-mail: geus@geus.dk

Geological Survey of Denmark and Greenland Bulletin: Scientific, internationally reviewed papers based on research results from Denmark, Greenland, the Faroe Islands and off-shore areas, as well as other countries where the Survey works. The Bulletin is currently published with three annual issues, including Review of Survey activities, which contains a number of concise 4-page contributions about selected research activities. All articles in the Bulletin series can be downloaded from:
www.geus.dk/UK/publications/geol-survey-dk-gl-bull/Pages/default.aspx