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11/03/2009 02:29:56
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P number: P521000
Caption: A fossil specimen of ?Echioceras rothpletzi Bose. A fossil ammonite. (Mollusca, Cephalopoda, Ammonoidea.) Shore 0.5 miles north-east of Dunrobin Castle, Golspie, Sutherland, Scotland.
Description: Echioceras is an ammonite with evolute keel with many whorls and widely spaced straight ribs. It had a worldwide distribution in the very early Jurassic. British Geological Survey Biostratigraphy Collection number GSE 3076. The history of the ammonites is one where type after type is raised to prominence, declines and then vanishes in rapid succession. There was a continual influx into British waters from the Mediterranean regions. The early Jurassic saw the rise and fall of a number of super families, the Psiloceratids, the Arietids, the Echioceratids and the Deroceratids of which Echioceras rothpletzi is a member. These were followed by the Polymorphitids and then the Hildoceratids - all with clear morphological evolution. The specimen is from the Jurassic Lower Lias, ?aplanatum zone.
Date taken: 01/01/2003
Photographer: Unknown
Copyright statement: NERC
Orientation: Portrait
Size: 297.04 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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