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Uploaded on:
11/03/2009 02:38:16
Type:
Digital Asset
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Dimensions:
1000 x 607 pixels
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P number: P521023
Caption: Fossil specimens of Calcirhynchia calcaria Buckman. A fossil brachiopod. (Brachiopoda.) '2 mile Burn' at lower waterfall of the two, Raasay, Invernessshire, Scotland.
Description: A Rhynchonellid brachiopod. Seven specimens. A small stout brachiopod almost triangular in outline with strong radial ribs or costae. There is a strong fold in the brachial valve and a corresponding deep sulcus or depression on the pedicle valve. British Geological Survey Biostratigraphy Collection number GSE 2355. There are many species of Rhynchonellids ranging from the Ordovician onwards. This specimen is from the Lower Lias jamesoni zone on Raasay, a time when marine transgressions over the land transformed much of Jurassic Europe into an enormous, generally shallow epicontinental sea. Brachiopods first appeared in the fossil record about 550 million years ago in the Cambrian Period. They are an entirely marine phylum. Their shell is composed of two valves which are composed of calcite or chitinophosphate.
Date taken: 01/01/2003
Photographer: Unknown
Copyright statement: NERC
Orientation: Landscape
Size: 89.60 KB; 1000 x 607 pixels; 85 x 51 mm (print at 300 DPI); 265 x 161 mm (screen at 96 DPI);
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