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Monday, October 12, 2015

Fossil Texture of a Strophostylus cyclostomus Snail

While looking at a chunk of Waldron Shale that had a crinoid calyx, the shale split revealing a small fossil fragment. This image was taken while it was under a microscope with a field of view of about 4 mm.


The Strophostylus cyclostomus was described by James Hall in the 1881 Indiana Geological Survey (pages 316-317; Plate 31 Figure 13). "An enlargement of the surface-striae of a full-grown specimen, showing the transverse striae of growth, and the finer revolving lines."

The image was taken with Moto G 2nd generation phone.


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1 comment:

  1. AnonymousOctober 14, 2015 at 11:50 AM

    Michael, look at the fossilera.com site and look at the Trilobite -conularia that is from the rochestor shale that is sold, but the conularia looks real close to this sample we are looking at. I have not found any snail with that shapes on the shell.
    kenny

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