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This is another fossil from the Silurian Leighton Fm, Maine. It is an excellently preserved internal and external mold of a brachiopod. It is similar to the Salopina species that I am constantly finding in this formation, but this brachiopod's valve is more strongly curved, instead of almost flat. It also has less numerous striae, and they almost reach the median process. As well as this, the dental plate is thinner and curves inward more strongly, and the ctenophoridium is wider. Any help on its identification would be greatly appreciated. Here are some pictures of it (internal mold on the left, external on the right):

 

1468889625_strophomenat1.thumb.jpg.b403b9939f31349ec0495b3dcc28e375.jpg    86269616_strophomenata2.thumb.jpg.ef4b9c74ada34617cdc5885e571442b4.jpg

 

1391209237_strophomenata.thumb.jpg.36125e6ce115837bc04b7547b867ac5d.jpg

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The more I learn, the more I find that I know nothing. 

 

Regards, 

Asher 

 

 

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  • Mainefossils changed the title to Brachiopod id
2 hours ago, Mainefossils said:

It is an excellently preserved internal and external mold of a brachiopod.

External overprinted on the internal ?

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That is a possibility, but I have multiple specimens with the same structural features, so it seems like it is actually the internal mold of the brachiopod. Thanks for your help!

The more I learn, the more I find that I know nothing. 

 

Regards, 

Asher 

 

 

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  • 4 months later...

@Rockwood and @Tidgy's Dad, it's been a while, but I have finally identified this brachiopod as Salopina submedia. The plate below shows this species. 

 

                                                                208332769_ScreenShot2021-07-30at2_38_59PM.thumb.png.1ff8bbb831fa09faddd96a31b0ae303b.png

From: Walmsley, V. G., Boucot, A. J., Harper, C. W. (1969) Silurian and Lower Devonian Salopinid Brachiopods. Journal of Paleontology, 43(2). 

 

Species description from the same paper, "Almost planoconvex, barely sulcate Salopina having a circular outline. Medium corse costellae radiate and curve laterally so that the posterior costellae of the branchial valve intersect the posterior margin at a considerable angle. Branchiophores moderately thick, straight blades."

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The more I learn, the more I find that I know nothing. 

 

Regards, 

Asher 

 

 

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wow. Those are gorgeous!

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Thanks so much everyone! 

The more I learn, the more I find that I know nothing. 

 

Regards, 

Asher 

 

 

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