P521010

Uploaded on:
11/03/2009 02:33:33
Type:
Digital Asset
File Size:
162.15 KB
Dimensions:
665 x 1000 pixels
3756 views 4 downloads
P number: P521010
Caption: A fossil specimen of Amoeboceras aff. superstes Phillips. A fossil ammonite. (Mollusca, Cephalopoda, Ammonoidea.) Plaidy, Aberdeenshire, Scotland.
Description: Amoeboceras is a genus belonging to the Subfamily Cardioceratidae from the Jurassic, Upper Corallian, serratum zone from Plaidy in Aberdeenshire. British Geological Survey Biostratigraphy Collection number GSE 5433. Green Spot. It is a finely ribbed form with a tabulate venter and minutely serrated keel, flanked either side by smooth bands or shallow sulci. The Cardioceratinae comprises four important genera, Quenstedtoceras, Goliathiceras, Cardioceras and Amoeboceras, they succeed each other stratigraphically with little overlap. The ammonites are very important for zoning the rocks in which they occur. They had rapid evolution, they were very abundant and very widespread and because of this high evolutionary turnover of species they have made it possible to create zones for periods less than one million years duration. They have been particularly useful for dating Triassic, Jurassic and Cretaceous rocks. Figd. J Pringle, Ammonites in Jurrasic Clay from Plaidy etc, Trans Edin Geol. Soc. Vol XIII, pt. III, 1936 pl. XIV.
Date taken: 01/01/2003
Photographer: Unknown
Copyright statement: NERC
Orientation: Portrait
Size: 162.15 KB; 665 x 1000 pixels; 56 x 85 mm (print at 300 DPI); 176 x 265 mm (screen at 96 DPI);
Average Rating: Not yet rated
Categories: Best of BGS Images/ Fossils  

Reviews

There is currently no feedback