Ordovician in Tennessee (Help!)

[DWhatley]

I was betting rock

 

[Architeuthoceras]

My vivid imagination at work.

The red is the two BCs, (the one on the right is questionable). The green is an imaginary crinoid stem with two bulges (parasitic infestations). Have you seen anything like this on a complete crinoid stem?

I may just be barking up the wrong tree.

 

[DWhatley]

like the ladder

 

[Terri]

Have you seen anything like this on a complete crinoid stem?

I don't think so, nothing that large. I went back and looked at the posts you mentioned, I can see some distortion in the first one.

I'm really liking the B.C. angle though. Here's a picture I took today....

 

[Architeuthoceras]

Looking like a BC

I think we can eliminate the pathologic crinoid hypothesis

 

[Terri]

Mystery solved! I was really getting tired of looking at this one, it was one of the first fossils I picked up at this location. I don't think I would have come to this solution on my own.

 

[Terri]

I'm really proud of this little fossil, it's the first one I found while learning how to split rock, there are a couple of pockets of gravel left behind (mostly hand size chunks) where I practice. So I've done a lot of browsing and can't figure out what it is, I'm wondering if it could be part of a gastropod shell? It's about 1 cm. long.

 

[Architeuthoceras]

It looks like a very nice little Horn Coral

Rugosa

Kentucky Horn Corals

Cincinnati Horn Corals

We get them in Devonian-Permian rocks out here, but not in the Ordovician. Nice find!

 

[Terri]

Well, I'm a little embarrassed, I searched everything but corals! I think the shell material is what threw me (looks like original shell material??). The Horn Corals I've found around here usually are covered with beekite, like these below. They're a little older too from the Ridley Limestone, middle Ordovician.You can see the beekite rings on the little broken one in the left top corner of pic. thanks for the id. and links.

 

[Architeuthoceras]

Wow! Those are really replaced! I can see why you wouldn't look at coral.


Thank you for the Beekite explanation, I have never heard of that before.

That explains the circular pattern on these little Triassic ammonoids.



Beekite Rings.

 

[Terri]

That IS really cool, I've only seen it on Horn Corals, I noticed the circular pattern on that first ammonoid when you first posted it, but didn't make the connection. I wonder why I only see it on corals?

I'm pretty sure I ran across an explanation of beekite from a link you supplied me with on the first page of this thread.

 

[Architeuthoceras]

I'm pretty sure I ran across an explanation of beekite from a link you supplied me with on the first page of this thread.

Nashville Geology Homepage, I didn't delve into it deep enough before. A very nice blurb on Beekite in the Fossil Formation Exercise.

I still think their trilobite is a cephalopod, unlike your trilobite in post #87

 

[Terri]

I still think their trilobite is a cephalopod, unlike your trilobite in post #87

Ostracods? I'm still shocked at finding such a large chunk of a trilobite around here and not another peep of one since then.

 

[Architeuthoceras]

Ostracods

 

[Terri]

Thanks for the link Kevin, awfully complicated for such a tiny creature. I'm pretty sure I have some or what I suspect to be Ostracods, I'll look tommorrow. They would be really hard to id. without a microscope or a really good camera.