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Tidgy's Dad

Also in the family Rafinesquinidae is this Megamyonia unicostata from the Maquoketa Group, Late Ordovician of Spring Valley, Minnesota.

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The steep anterior :

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Side view showing the slope :

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In the same rock is this impression. This one could be Thaerodonta :

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So thank you very much Ralph @Nimravis for this specimen.

 

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Tidgy's Dad

As a bonus item in a recent auction win, I received these pieces of matrix from the Kope Formation of Campbell County, Kentucky from @ClearLake, so thanks very much for these, Mike, old chap. :i_am_so_happy:

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The Kope Formation marks the base of the Cincinnatian Series of the Late Ordovician. The top of it, which can be rich in Vinlandostrophia ponderosa brachiopods is present at the Lawrenceburg site from which I have a lot of specimens, but most of the fossils from that location seem to come from the overlying Fairview Formation. Most of the Kope seems not to be as diverse in brachiopod species as the Fairview, but the species that do occur can be very numerous as in these pieces that seem to only contain the one species, Cincinnetina multisecta which can also be found abundantly, but interspersed with other species in the Fairmount. 

 

Here are some Cincinnetina multisecta from these new Kope Formation mini-hash pieces :

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The pieces are full od bits of crinoid and bryozoan. 

The most common bryozoan seems to be the tiny Bythopora arctipora, branches 1 to 1.5 mm wide.  And a Flexicalymene thoracic segment. 

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Nice to have these Bythopora arctipora as I have other species of the genus from the younger Fairview and Liberty Formations.

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This one's a bit different from Bythopora arctipora, you can see Bythopora on the left of the photo and the specimen on the right is even thinner, 1 mm or less wide, bifurcates differently and has spines around the zooecia. I think this is Parvohallopora onealli, very different to the species of Parvohallopora in my collection from the overlying Fairview and even later Liberty Formations. 

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Some lovely recent updates to your thread Adam! Beautiful Cincinnetina multisecta and nice bryozoans. Did you spot the little Parvohallopora onealli with your microscope? Good eye! :look:

 

I don’t have anything from the Kope Formation yet. I’m :envy:!

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6 hours ago, FossilNerd said:

Some lovely recent updates to your thread Adam! Beautiful Cincinnetina multisecta and nice bryozoans. Did you spot the little Parvohallopora onealli with your microscope? Good eye! :look:

 

I don’t have anything from the Kope Formation yet. I’m :envy:!

Thank you, Wayne, you can find lots of beautiful examples of Cincinnetina multisecta from the Lawrenceburg road cut and likely from the Fairview Formation near the bottom of Page 12 of this thread. I don't have much from the Kope Formation, so these little hashes are very welcome. I am gradually managing to accumulate quite a decent collection of material from different formations of the US Cincinnatian. 

 

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Here is the disc shaped bryozoan Aspidopora newberryi which is the other common species found in the Kope. 5 to 7 mm or so in diameter, but these are broken fragments and so only half the size. Some of them could be other rarer species of Aspidopora that do occur in the Kope Formation, but I can't really tell the difference so they should be labelled Aspidopora sp. 

Bit of genal spine/ free cheek just above this first fragment, I think. 

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There are also quite a lot of tiny trilobits in this Kope Formation matrix.  

I posted this bit earlier and think it is a thorax segment from Flexicalymene granulosa. I have different species of Flexicalymene from different continents and ages of the Ordovician. What a successful genus it was and what a range of sizes! 

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Most of these other bits are only one to 3 mm. 

I think these are F. granulosa librigenae :

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Bit of cranidium? 

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6. A cranidium of what? 

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7. Tiny spiky bits maybe from Acidaspis cincinnatiensis? Or Primaspis crosutus? This was a long ranging species, I have bits from other Formations in the Cincinnatian too. 

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8.

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9. Genal spine / free cheek from ? 

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10. Another spine or two :

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11. Spine with tubercles

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Any help with these much appreciated. 

Ideas, Scott, if you have a moment, please? @piranha

Thank you to all who have a looksie. 

 

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Tidgy's Dad

The stem sections with a five-pointed star shaped articulation on the columnals are Cincinnaticrinus

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Possible crinoid holdfast near the bottom of the photo?

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Tidgy's Dad

Some pieces are packed with crinoid remains. This piece shows Cincinnaticrinus, but most of the others will likely be the common Ectenocrinus simplex, though other crinoids are present in the Kope Formation. 

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Crinoid bits

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Glyptocrinus? ; 

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Base of a calyx? 

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Holdfasts are often not attributable to a species and are called "Lichenocrinus" I think this is one, but it may be a columnal from the stellate stemmed Iocrinus. 

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I think this is another Lichenocrinus holdfast anchored to an Aspidopora bryozoan which is quite a common occurrence 

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Tidgy's Dad

Just found this one.

In between the broken brachiopod bits is something interesting.

It's clearly echinoderm but what? A crionoid calyx plate or something from one of the more unusual echinoderms?

About 2 mm across.

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