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Uploaded on:
11/03/2009 02:28:13
Type:
Digital Asset
File Size:
129.87 KB
Dimensions:
1000 x 665 pixels
131 views 4 downloads
P number: P520995
Caption: A fossil specimen of cf. Pteria papyria Quenstedt. A fossil bivalve. (Mollusca, Bivalvia.) Allt Fearns, north of the road, 1.75 miles east of Inverarish, Raasay, Invernessshire, Scotland.
Description: Pteria (synonym Avicula), a bivalve, has an oblique oval shell slightly inequivalve. It belongs to the monomyarian (having only a posterior adductor muscle) order Pteroidea of the Pteriomorphia subclass of bivalves. British Geological Survey Biostratigraphy Collection number GSE 2303. It is found in the Lower Jurassic, Lower Lias raricostatum zone from Raasay. The Lias was a marine shale facies that in Skye and Raasay consisted of the lower Broadford Beds composed of limestone and shales and the upper Pabba Shales consisting of sandy micaceous shales. Bivalves belong to the Phylum Mollusca and Class Bivalvia. They have two hard, usually bowl-shaped shells called valves. The shells are rarely preserved together as the elastic hinge tissue that hold the valves together usually decays and the valves separate.
Date taken: 01/01/2003
Photographer: Unknown
Copyright statement: NERC
Orientation: Landscape
Size: 129.87 KB; 1000 x 665 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI);
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