Help with Mississippian crinoid calyx

[fossilized6s]

I took my 4 year old Son geode and fossil hunting near the Missouri, Iowa, Illinois borders last weekend. We had a blast and found a lot of cool stuff. I found this calyx in the Warsaw formation which is Mississippian.

 

It's obviously not done being prepped, but i figured there might be enough showing to get your opinions. It's actually been quite a challenging prep and may take some time to finish. 

 

I was thinking a possible Agaricocrinus sp., but it doesn't quite fit the bill. I can't find anything that looks identical. 

 

Any help is appreciated. 

 

@crinus @Crinoid Queen you guys still around? 

 

As found

 

 

Some prep

 

 

 

 

 

 

 

 

 

[Rockwood]

Is this a common form of preservation in that area ? I wouldn't have recognized it as crinoid. 

[ynot]

It looks like a distortion caused by the "geodization"  process.

The distortion may make an ID very hard.

[fossilized6s]

6 hours ago, Rockwood said:

Is this a common form of preservation in that area ? I wouldn't have recognized it as crinoid. 

 

This was my first time hunting that area. It's all typical limestone preservation. 

 

1 hour ago, ynot said:

It looks like a distortion caused by the "geodization"  process.

The distortion may make an ID very hard.

 

Not sure it's "geodized", but definitely harder than the surrounding limestone. I know there's a term for it, but i don't remember. Haha

 

"Siliconized".......?

[ynot]

5 minutes ago, fossilized6s said:

Not sure it's "geodized", but definitely harder than the surrounding limestone. I know there's a term for it, but i don't remember.

Silicified.

 

The process that creates the geodized fossils is also what causes the silicification of the fossils.

The area that is mentioned in Your post is known for geodized fossils, they are called "midwestern sedimentary type geodes".

Not to say that all formations in that area are distorted geodized fossil formations.

 

[fossilized6s]

1 hour ago, ynot said:

Silicified.

 

The process that creates the geodized fossils is also what causes the silicification of the fossils.

The area that is mentioned in Your post is known for geodized fossils, they are called "midwestern sedimentary type geodes".

Not to say that all formations in that area are distorted geodized fossil formations.

 

Thanks. That's the word i was looking for. 

 

Yeah we originally went there for geodes, but there also a lot if fossils as well. Surprisingly we found very few geodized fossils. And 99% were preserved pretty well, without distortion. 

[Xiphactinus]

That looks to be Agaricocrinus. They are common in both the Warsaw and Burlington formations from the area you were hunting. Nice!

[fossilized6s]

6 hours ago, Xiphactinus said:

That looks to be Agaricocrinus. They are common in both the Warsaw and Burlington formations from the area you were hunting. Nice!

 

Thank you for your input, sir. I can't find an example of Agaricocrinus with these large "bumps"on the sides. Do you know of a good reference?

 

 

 

[Xiphactinus]

Here’s an image from Index Fossils of North America. There are several species but you can see the general shape. 

[crinus]

I think what you have there is  some type of Dorycrinus.  The "bumps" are probably the remains of the spines that would be typically be on the tegmen of the calyx. 

 

Joe

[abyssunder]

1 hour ago, crinus said:

I think what you have there is  some type of Dorycrinus.  The "bumps" are probably the remains of the spines that would be typically be on the tegmen of the calyx. 

 

Joe

I agree! That would be close.

[fossilized6s]

2 hours ago, crinus said:

I think what you have there is  some type of Dorycrinus.  The "bumps" are probably the remains of the spines that would be typically be on the tegmen of the calyx. 

 

Joe

Thanks, Joe. I knew you would know.

 

Hopefully next time i can find a more complete specimen.