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Cyrtina hamiltonensis from the Silica Shale of Michigan
Source info:
| Author: | Dave |
|---|---|
| Date: | 2014-09-26 09:01:00 |
| Blog: | Views of the Mahantango  |
| URL: | http://viewsofthemahantango.blogspot.com/2014/09/cyrtina-hamiltonensis-from-silica-shale.html |
Summary:
The triangular shape shell of Cyrtina is very easy to spot. It is a prolific member of many Devonian communities and is one of the more common fossils found. The specimen below is Cyrtina hamiltonensis and was found in the Silica Shale (Devonian, Givetian stage) at Milan, MI.Brachial valveAnterior Pedicle valvePosteriorProfileSome other examples of Cyrtina that I've blogged about are Cyrtina umbonata from Michigan, Cyrtina sp. from Iowa, Cyrtina arkonensis from Ontario, other Cyrtina species from Ontario.Allow me a moment to explain my thought process behind this blog. The photo of the pedicle valve shown above was taken with far end of the pedicle valve in focus and so the tip closest to the camera is out of focus. Still, it gives you a view similar to those you find in older reference books with hand drawn illustrations of fossils. Imagine how frustrating it would be to try and ID your fossil when they only give you a view of the pedicle valve and brachial valve similar to my above pictures. This is part of the reason why I include anterior, posterior and profile views in my posts.Content analysis:
Stratigraphic context:
| Recognized stratigraphic terms [n]: | Devonian [2] Givetian [1] Silica Shale [2] |
|---|---|
| Agenames chronostratigraphy [rating]: | Devonian [0.76] Paleozoic [0.76] Phanerozoic [0.76] Givetian [0.1] Middle Devonian [0.61] |
Geographic context:
| Location | Country | Latitude | Longitude |
|---|---|---|---|
| Iowa | US | 41.9383 | -93.3899 |
| Michigan | US | 43.7427 | -84.6217 |
| Milan | IT | 45.4781 | 9.17789 |
| Ontario | CA | 49.3843 | -84.7563 |
Keywords:
Brachiopod, common fossils, Cyrtina arkonensis, Cyrtina hamiltonensis, Cyrtina sp., Cyrtina species, Cyrtina umbonata, Devonian communities, Givetian stage, MI.Brachial valveAnterior Pedicle, older reference books, pedicle valve, profile views, prolific member, Silica Shale, triangular shape shell, valvePosteriorProfileSome other examples
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