File:P521164.jpg

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P521164.jpg(800 × 532 pixels, file size: 126 KB, MIME type: image/jpeg)

Summary[edit]

A fossil specimen of Dimorphograptus decussatus. A fossil graptolite. (Graptolithina.) Port Gower, Grennan Point, Wigtownshire, Scotland. This specimen of graptolite, Dimorphograptus decussatus is possibly from the atavus Biozone of the Silurian and was found at Port Gower, Grennan Point. British Geological Survey Biostratigraphy Collection number GSE 14927. Dimorphograptus is a genus where the proximal part of the rhabdosome is uniserial due to loss of thecae while most of the rhabdosome is biserial. During the Silurian the monograptid fauna developed from Lower Silurian simple thecal types of Monograptus and numerous biserial forms such as Orthograptus and Dimorphograptus. The Middle Silurian saw the acme of hooked types and dominance of cyrtograptids while the Upper Silurian saw a dominance of monograptids with simple thecal types. P521164

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File history

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Date/TimeThumbnailDimensionsUserComment
current20:23, 3 August 2015Thumbnail for version as of 20:23, 3 August 2015800 × 532 (126 KB)JenniferFindlay1 (talk | contribs)A fossil specimen of Dimorphograptus decussatus. A fossil graptolite. (Graptolithina.) Port Gower, Grennan Point, Wigtownshire, Scotland. This specimen of graptolite, Dimorphograptus decussatus is possibly from the atavus Biozone of the Silurian and wa...
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