Uploaded on:
11/03/2009 02:29:12
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P number: P520998
Caption: A fossil specimen of Graphoceras arcitenens S.S. Buckman. A fossil ammonite. (Mollusca, Cephalopoda, Ammonoidea.) From fallen blocks on shore between Bearreraig Bay & Holm Island, Skye, Invernessshire (Skye), Scotland.
Description: A member of the Ammonoidea, an extinct group of the Cephalopoda. The shell is composed of three main parts, the protoconch, the phragmacone and the body chamber. Graphoceras is coiled in a plane spiral. The phragmacone is a chambered shell that was used as a means of buoyancy allowing exploitation of rich food resources in water columns. It was an active carnivore with highly developed sensory organs. British Geological Survey Biostratigraphy Collection number GSE 3027. Other than the fishes, the ammonites were the most accomplished swimmers in the sea. A totally marine group. Stratigraphically the ammonites ranged from the Devonian to the Cretaceous. This specimen is Jurassic, Inferior Oolite from the concava zone in age.
Date taken: 01/01/2003
Photographer: Unknown
Copyright statement: NERC
Orientation: Portrait
Size: 130.17 KB; 665 x 1000 pixels; 56 x 85 mm (print at 300 DPI); 176 x 265 mm (screen at 96 DPI);
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Categories: Best of BGS Images/ Fossils  


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