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Early in the summer, an attempt was made to hunt a different Ordovician formation than I normally collect in. It provided me with a learning experience and some new and neat fossils. Having enjoyed my finds so much,  a return trip was made 2 weeks ago. Not to the same site but to a more extensive exposure of the Elgin Formation of the Maquoketa close by. The location is in NE Iowa in some beautiful farm country. Even if I found no fossils the view from here made the trip worthwhile.

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Now for the finds. I am a novice at identifying fossils from this formation and am open to any suggestions or changes to my identifications. 

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Here is a sediment filled cephalopod  with Dalmanella on it. Only one was truly part of the find. Which brachiopod belonged to the cephalopod?

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This one!! 

 

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 Cephalopods of all types and sizes abounded in this formation. 

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 This is one cephalopod I would love an ID of. The linear stripes are new to me.

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 Epibionts were common on the brachiopods. 

  

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Now on to the trilobites. First up is a picture of a u shaped structure just 5 mm long. Is it a hypostome. If so, what trilobite? 

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Many pictures that I hope you enjoyed!

  

Mike

Edited by minnbuckeye
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Wow, neat finds! A lot more diversity than I personally have ever encountered in the Maquoketa.

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Awesome finds on that hunt, Mike! Great pics and IDs! Looking forward to seeing the ID on that Unknown Cephalopod!  :-D

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That unknown cephalopod looks like a tusk shell (a scaphopod).  Are tusk shells known from this age rocks?

 

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Dang! Did you find all of those in one day? Did they require much prep, or did weathering do most of the work? What a wonderful haul. I have read of Scaphopods in the Galena group, so it’s quite possible they are in the Maquoketa as well. I plan on collecting more often in north eastern Iowa, and I wonder what reference materials you use for your IDs. 
Thanks for sharing! 

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Hi, Mike. 

First : :default_faint::b_love1::envy: etc. 

With that out of the way, I think :

Crania laelia is now Philhedra laelia.

I've never heard of Dalmanella macrior, but those are stunning.

It's Dinorthis proavita. 

And Sowerbyella sericea.

 

Scaphopods don't appear until the Carboniferous, a possible ancestral form is found in the Ordovician but only in Kentucky. 

I think the unknown roller is another Anataphrus vigilans.

 

Zygospira modesta, I think. 

Rhynchotrema capax is now Hiscobeccus capax. 

 

Marvelous finds, Mike. 

 

 

 

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Scaphopods sure look similar but for now, I am sticking to cephalopod. If you look beyond the horizontal ornimentation that mimics scaphopods, there is evidence of septal divisions running perpendicular to the long axis.

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andy_mnemonic
31 minutes ago, minnbuckeye said:

 

Scaphopods sure look similar but for now, I am sticking to cephalopod. If you look beyond the horizontal ornimentation that mimics scaphopods, there is evidence of septal divisions running perpendicular to the long axis.

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Looks similar to Metaspyroceras from the Ordovician formations in the Twin Cities, MN.

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Great finds Mike!  Some very nice preservation there. 

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Great finds.

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Beautiful brachiopods. Is it possible the unknown cephalopod is an echinoid spine?

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