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Uploaded on:
11/03/2009 02:40:45
Type:
Digital Asset
File Size:
188.85 KB
Dimensions:
665 x 1000 pixels
67 views 4 downloads
P number: P521030
Caption: A fossil specimen of Ludwigia sp. (obtusa group). A fossil ammonite. (Mollusca, Cephalopoda, Ammonoidea.) From fallen blocks on shore between Bearreraig Bay & Holm Island, Skye, Invernessshire (Skye), Scotland.
Description: Belonging to the Superfamily Hildocerataceae, the genus Ludwigia is characterized by fairly stout forms with a moderately wide umbilicus, the depression caused by the last complete whorl of the shell. Note the complex suture line with the saddles projecting forwards and the lobes projecting backwards. Note also the ammonite-type suture with smaller folds on the main lobes and saddles. British Geological Survey Biostratigraphy Collection number GSE 3010. An Upper Jurassic form from the Inferior Oolite, murchisonae zone of Skye. The Ludwigian fauna preceded the later Sonninian fauna. The Inferior Oolite is well developed in the Hebridean region and is very similar to that in England. It attains a maximum thickness in Skye (375 feet) and Raasay (600 feet) and represents a period of marine incursion of a warm sea.
Date taken: 01/01/2003
Photographer: Unknown
Copyright statement: NERC
Orientation: Portrait
Size: 188.85 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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