TAILIEUCHUNG - Ammonite faunas and stratigraphy of Lower Cretaceous (Albian) rocks in southern Spitsbergen

The upper part of the Lower Cretaceous (Aptian and Albian) in Spitsbergen is represented by the marine Carolinefjellet Formation, which consists chiefly of shales, siltstones, and sandstones. In this paper five members are recognized within the formation, and a brief lithological description is given for each member. The two uppermost members, Zillerberget and Schonrockfjellet, are defined as new. | NORSK POLARINSTITUTT SKRIFTER NR. 152 JENO NAGY Ammonite faunas and stratigraphy of Lower Cretaceous Albian rocks in southern Spitsbergen NORSK POLARINSTITUTT OSLO 1970 Contents Page Abstract . 5 Preface . 6 I. INTRODUCTION . 7 The regional background. 7 The investigated sections and fossil localities . 7 II. HISTORICAL REVIEW . 11 Subdivision and nomenclature of the Carolinefjellet Formation. 11 Previous reports on Albian ammonites . 11 III. STRATIGRAPHICAL PART . 14 Lithostratigraphy of the Carolinefjellet Formation . 14 1. The Dalkjegla Member. 14 2. The Innkjegla Member . 14 3. The Langstakken Member . 16 4. The Zillerberget Member . 16 5. The Schonrockfjellet Member . 17 Ammonite faunas and correlations . . 18 1. Freboldiceras fauna. 19 2. Arcthoplites fauna. 21 3. Otohoplites fauna . 21 4. Hoplites fauna. 22 5. Species of Dimorphoptites Euhoplites and Gastroplites . 23 Paleogeographical conclusions. 24 The Aptian-Albin sea in Spitsbergen. 24 Faunal comparisons . 25 The pre-Tertiary earth movements . 27 IV. PALEONTOLOGICAL PART . . 30 Material and methods. 30 Systematic descriptions . 31 List of descriptions with page references . 31 Descriptions. 32 AhhOTHIIIIÍỈ Abstract in Russian . 55 Literature cited . 56 Plates . 60 Abstract The upper part of the Lower Cretaceous Aptian and Albian in Spitsbergen is represented by the marine Carolinefjellet Formation which consists chiefly of shales siltstones and sandstones. In this paper five members are recognized within the formation and a brief lithological description is given for each member. The two uppermost members Zillerberget and Schonrockfjellet are defined as new. The age relationships within the Carolinefjellet Formation are elucidated by means of the recognized ammonite faunas. In the lower part of the formation occurs the Tropaeum fauna which is of Upper Aptian age. In the middle part of the formation occur four successive ammonite faunas which are correlated with the following parts of the Albian of .

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• The Dalkjegla Member
• The Zillerberget Member
• The Schonrockfjellct Member
• Freboldiceras fauna
• Arcthoplites fauna
• Otohoplites fauna