Emericiceras, Ancyloceras, Nautilus, Acrioceras, Crioceras, Barremites Morocco, Tamanar region Lower Cretaceous, Barremian, around 115 million years 80 x 80 cm Provenance: Swiss private collection Ammonites are fossilized shells of extinct cephalopods and are equally important for the study of geology and paleontology. Thanks to their great variety of forms and unique beauty, they are popular collectors items. Ammonites were named "Ammons horns" after the ancient Egyptian god of life and reproduction, who was usually depicted with rams horns. Ancyloceras is an extinct genus of heteromorph ammonites found worldwide during the Lower Cretaceous. The basic shape of the calcareous shell of the ammonites is a conical tube, which is rolled up in the manner of a logarithmic spiral to form a so-called plane spiral. Partly, housings developed, which unrolled in all spatial directions. The forms called aberrant or heteromorphic ammonites were considered for a long time as "abnormal", as evolutionary degeneracy. In part, this was even used to explain the extinction of ammonites. In more recent research, these forms are rather seen as adaptations to the strong sea level rises towards the end of the Secondary Era. Ammonites populated the seas during a long time, and the first known forms date from about 400 million years ago. They died out only at the end of the Cretaceous 65 million years ago, at the same time as the dinosaurs. The group of ammonites presented here shows an incredible number of species and subspecies. The fascinating and almost impossible thing about this wonderful group is the fact that it was found and prepared exactly like this by a palaeontologist. The various cephalopods all show a very good state of preservation and very little restoration. AMMONITEN GRUPPE Emericiceras, Ancyloceras, Nautilus, Acrioceras, Crioceras, Barremites Marokko, Region Tamanar Untere Kreidezeit, Barremium, um 115 Millionen Jahre Masse: 80 x 80 cm Provenienz: Schweizer Privatbesitz Ammoniten sind versteinerte Geh?use ausgestorbener Kopffüsser und für die Erforschung von Geologie und Pal?ontologie gleichermassen wichtig. Dank ihrer grossen Formenvielfalt und einzigartigen Sch?nheit sind sie beliebte Sammlungsstücke. Ammoniten wurden nach dem meist mit Widderh?rnern dargestellten, alt?gyptischen Gott des Lebens und der Fortpflanzung als "Ammons-H?rner" benannt. Ancyloceras ist eine ausgestorbene Gattung der heteromorphen Ammoniten, die w?hrend der Unterkreide weltweit gefunden wurde. Die Grundform des kalkigen Geh?uses der Ammoniten ist eine kegelf?rmige R?hre, die nach Art einer logarithmischen Spirale zu einer sogenannten Planspirale eingerollt ist. Zum Teil entstanden Geh?use, die sich in alle Raumrichtungen entrollten. Die als aberrante oder heteromorphe Ammoniten bezeichneten Formen galten lange als "abnorm", als evolution?re Entartung. Teilweise wurde damit sogar das Aussterben der Ammoniten erkl?rt. In der neueren Forschung werden diese Formen vielmehr als Anpassungsversuche an die starken Anstiege der Meeresspiegel gegen Ende des sekund?ren Zeitalters gewertet. Ammoniten bev?lkerten w?hrend langer Zeit die Meere, so sind erste Formen bereits vor rund 400 Millionen Jahren bekannt. Sie starben erst am Ende der Kreidezeit vor 65 Millionen Jahren aus, gleichzeitig wie die Dinosaurier. Die hier pr?sentierte Gruppe von Ammoniten zeigt eine unglaubliche Anzahl von Arten und Unterarten. Das faszinierende und fast unm?gliche an dieser wunderbaren Gruppe ist die Tatsache, dass sie von einem Pal?ontologen genau so gefunden und pr?pariert wurde. Die verschiedenen Kopffüsser weisen alle einen sehr guten Erhaltungszustand und sehr wenig Restaurationen auf.
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