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A Trip to the Devonian of Iowa


Peat Burns

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Thanks to @minnbuckeye who gave me a site suggestion to an Iowa Devonian locality when I was on my way to the White River Formation of Nebraska, I was able to satisfy my palaeozoic fix this past June.  Here are my finds (scale in photos is cm/mm):

 

Orthospirifer cf. O. cooperi

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Strophodonta sp.

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Cranaena sp.

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Close-up of Cranaena showing characteristic pores of Terebratulida

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I haven't spent time on this large brachiopod yet.  Maybe a Schizophoria?

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Hexagonaria sp.

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Unidentified Rugosa.  Still struggling to ID these.  Might be Aulacophyllum or Tortophyllum.  Gonna try the acetate peel next...

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Just now, Tidgy's Dad said:

Nice finds. :)

Those horn corals are very interesting. 

Thanks TD. I love horn corals.  I think it's childhood nostalgia.  They were common in the glacial deposits where I lived.  Same goes for brachiopods.  Love 'em.:)

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Nice finds, I realy like the hexagonaria. I see them a lot arround here to.

growing old is mandatory but growing up is optional.

 

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6 hours ago, Peat Burns said:

Terrabratulida2017 - Brachiopod Aficionado

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Close-up of Cranaena showing characteristic pores of Terrabratulida

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 Terebratulids typically have biconvex shells that are usually ovoid to circular in outline. They can be either smooth or have radial ribbing. The lophophore support is loop shaped in contrast to the spiralia of similar looking spiriferids. Terebratulids are also distinguished by a very short hinge line, and the shell is punctate in microstructure. There is a circular pedicle opening, or foramen, located in the beak.

 

Learn something every day! Nice specimens for your short stop! But where are your Nebraska finds????

 

 Mike

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9 hours ago, Ludwigia said:

Nice finds! And thanks for the closeup of that brachiopod. I wasn't aware of that.

 

Thanks Ludwigia.  Isn't that cool?!

8 hours ago, Manticocerasman said:

Nice finds, I realy like the hexagonaria. I see them a lot arround here to.

Thanks!

 

7 hours ago, Monica said:

A very pretty set of brachiopods and other inverts - well done! :dinothumb:

 

Thanks, Monica!

5 hours ago, minnbuckeye said:

 

 

 Terebratulids typically have biconvex shells that are usually ovoid to circular in outline. They can be either smooth or have radial ribbing. The lophophore support is loop shaped in contrast to the spiralia of similar looking spiriferids. Terebratulids are also distinguished by a very short hinge line, and the shell is punctate in microstructure. There is a circular pedicle opening, or foramen, located in the beak.

 

Learn something every day! Nice specimens for your short stop! But where are your Nebraska finds????

 

 Mike

Hi Mike.  I'm still holding out on the entire trip report while I prep and reconstruct a partial oreodont skeleton, coming soon to the prep subforum!

 

However, here is the big Stylemys tortoise I recovered :):megdance:

 

 

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