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It was suggested that the photos below are of Coral fossil cyclolite.  However, I can't find any information with that name.  Does anyone know what it is?  Perhaps it has another name? Approx. 1/2" dia.

Thanks

Greg

 

 

disk (2).jpg

disk edge (2).jpg

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Cyclolites is a name often used to describle corals from the family Fungiidae, but this family are scleractinians and thus didn't exist in the Devonian. 

Your looks like it might be something like Microcyclus.thedfordensis. 

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Cyclolites fossil? 

*Edit* what he said.. just before me. :DOH:

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33 minutes ago, Tidgy's Dad said:

Cyclolites is a name often used to describle corals from the family Fungiidae, but this family are scleractinians and thus didn't exist in the Devonian. 

Wrong.

Cyclolites is a genus from the Cyclolitidae family. Fungiidae is other family. Both families belong to Scleractinian order but are very diferent families.

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1 hour ago, oyo said:

Wrong.

Cyclolites is a genus from the Cyclolitidae family. Fungiidae is other family. Both families belong to Scleractinian order but are very diferent families.

Indeed. 

It's very confusing. 

But i think the species Cycloseris cyclolites, often also incorrectly called 'Cyclolites' is from the Fungiidae? 

And Cunnolites, which was renamed from Cyclolites is now family Cunnolitidae? 

Anyway, the OPs fossil is none of these.  

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It is not confusing at all.

Cycloseris is a genus from the Fungiidae family.

Cunnolites is sinonim of Cyclolites. Cunnolitidae is sinonim of Cyclolitidae.

Fungiidae and Cyclolitidae are two diferent families with morfological caracteristics absolutely diferents.

Very simple and clear.

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Would this have eventually developed into a horn coral or would it have remained the same size and shape?

Thanks

Greg

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7 minutes ago, grg1109 said:

Would this have eventually developed into a horn coral or would it have remained the same size and shape?

Thanks

Greg

It would have remained in its discoidal shape. Their size range is about 4 -15mm in diameter.

That being said, I have doubts that this is a "button coral" (cf. Microcyclus) given how the "grooves" are a bit too numerous and too straight in the way it radiates. In addition, these rarely ever exceed about 2 mm in thickness, and generally have a "crimped" edge. I would wager this might be a weathered single crinoid columnal.

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Rugose Coral, Stable Isotope Signatures of Middle Palaeozoic Ahermatypic Rugose Corals –  Deciphering Secondary Alteration, Vital Fractionation Effects, and  Palaeoecological Implications

Cyclolite, image.jpeg.7788589cfde1c81ae35f897f820fbb76.jpeg

Crinoid Columnal, image.jpeg.165152497160bb4d67562b566b0af11a.jpeg

 

 

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Thanks for the photos, I've had a hard time finding them.  I think mine looks more like "J" in the first photo.

Greg

Top.jpg

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I am sort of with @Kane on this one, I think it could be a crinoid columnal something like one of the ones I have copied below (from Jeffords book).  I think I see in that last picture posted the makings of a floriform lumen (the center part) as I have tried to trace in light red line on the bottom picture.  I am not really familiar with the Cyclolites, so maybe I'm just overlooking the obvious, but....

 

 image.png.9b967ffc63925d6ae6fd03f6bade6745.pngimage.png.6b5648bb18ef57a9cef99c6839ca7eae.png    image.png.93d8d27613732222aec19e644a95af63.png  image.png.c92779b69c439a52a7f80c4c5f57af0c.png 

 

image.png.661f56092279d9e8c785cfac8c720fde.png

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I see what you mean...so, I took the closest photo that is possible for me to take of just the center.  I re measured it.  It is 13mm in dia. and 4mm thick.

Greg

center.jpg

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6 minutes ago, Kane said:

Any chance you could show us the reverse side? 

I added measurements to previous post as you were posting.  Here are photos of the reverse side and the reverse side center.

Greg

reverse side.jpg

reverse center.jpg

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I see crinoid as others have. Here’s some shots of comparable morphology cut and almost polished:

 

A3934A5F-8776-455D-B3AF-5A3BCFE96D0A.jpeg

D13C2BA0-C7BD-4BF2-9798-09D62E366E7F.jpeg

093EF9BB-BE4A-4015-A0C0-E7CD4A51DE0D.jpeg

 

I remember finding many similar specimens at Freeport beach on Lake Erie back in the day...might even still have a fey in my collection at home.

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1 hour ago, grg1109 said:

shouldn't they have straight sides

No, not necessarily.  Crinoid stems come in many shapes and forms, including the shape of the side of each columnal.  Straight, rounded, triangular, etc.

 

image.png.db197d643707e1af5f8a936106a8c4fd.png  image.png.d27d8b12a35313f04bac0b097c480d98.png  image.png.b9a7c0e25172687595cc22de789f52ae.pngimage.png.5f871c91753dab77309a07f83a5d217c.pngimage.png.f3e36b4db01b8ef004d175e044f260ab.png  

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