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Decorah Shale, heavy on Brachiopods

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Tidgy's Dad

Wonderful diversity of brachiopods. :wub:

Beautiful photos. 

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Ash

Beautiful colours in there. Love it!

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Peat Burns

:wub:

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Monica

I, too, love the colours of your specimens - I especially like the pinkish Rafinesquina specimens, like this one: 

DSC_0054-003.thumb.JPG.066d09a1e2657d15c38110a24de6616d.JPG

:wub:

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Bev

Great finds, Mike! Your photography of the subjects is FANTASTIC!  :envy:

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Al Tahan

I really like the colors on theses. I have the same fear about some sites I go to....there is always a fear of an expiration date. Beautiful looking brachs :)

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JamieLynn

What is this? 

 

2019-05-045.jpg.23a18d4dfb2517de03674e77e11c351a.jpg

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minnbuckeye
47 minutes ago, Bev said:

Your photography

 

@Bev, it is easier to take the time to do when you're stuck in the house. I have taken many many more photos of fossils and other subjects since the virus appeared. So here is a silver lining to that dark cloud.

 

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minnbuckeye
16 minutes ago, JamieLynn said:

What is this? 

JamieLynn, I find these frequently. They are little perfectly round balls less than 1/2 cm in diameter with no signs of attachment to something. My suspicion is a type of sponge, but who knows???? Maybe I will put it in fossil ID.

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Shamalama

Those small round objects stippled with pores are Hinda sp. sponges. Somewhat common in the Ordovician but they exist up through the Paleozoic as well.

 

oops, forgot to add the quotes.

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minnbuckeye

@Shamalama, did you mean Hindia? Not much showed up looking for Hinda. Did these sponges attach to the bottom? I never can visualize a spot where attachment would occur.

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Shamalama
21 hours ago, minnbuckeye said:

@Shamalama, did you mean Hindia? Not much showed up looking for Hinda. Did these sponges attach to the bottom? I never can visualize a spot where attachment would occur.

Yup, Sorry, I meant Hindia. They didn't attach to the bottom I think they rolled along the bottom below wave base. Or perhaps they were able to float just a little above the sediment. Just my ballpark guessing, I really don't know for sure. 

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Bev

Chapter 4 of Robert Sloan's book "Minnesota Fossils and Fossiliferous Rocks" has both photos and drawings of brachs and bivalves. It is THE book to have for the Ordo in Minnesota.

 

The "Index Fossils of North America" Shimer and Shrock is nicely illustrated with photos and drawings also.

 

There is a guy in Red Wing who sells fossils on online who can identify pretty much all of the brachs by sight, I forget his name and he isn't on TFF nor does he want to be.

 

Yes, there are silver linings to this stay-at-home order. I've been doing a lot of gardening, bought a new camera (Nikon D3300) I'm trying to figure out, and yesterday I was making goat horn jewelry and attempting to do a photo shoot with Athena and Artemis - they move so much it is hard to focus!

Athena

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Artemis

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Arty showing off her moves!  LOL  :-D

 

5e8f3d8fa51d3_1artyrearingrs.thumb.jpg.5782b4ed5300a7fdf0e7fd0fb9c3cfc0.jpg

 

Last summer did I take you to the Valley of the Fisherites off Hwy. 16? Lovely spot with a Missouri Crossing - they paved right over a bed of Fisherites!

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minnbuckeye

Tanks Bev. Good suggestions. Do you have these books? Lovely caprine pics. Is the one pregnant? Not sure where the fisherite site is. Would love to see the Missouri crossing. The neighbor that has easement through our property talked me into letting them build a bridge across our trout stream. I relented (their architect convinced them to build a 3 1/2 ft high bridge) but in hindsight, should have forced them to put in the Missouri crossing. now the bridge just acts like a net catching all that floats downstream after a river rise. If you could let me know where that crossing (And fossils) is, I would like to visit the site and take some pictures.

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Bev

Yes, I have the books and if you would like to borrow them you are welcome. Stop by and we can drive separately and I will show you the site. A good rise on the creek and a downed tree will take the bridge out eventually. Then suggest a Missouri crossing.  :-)

 

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Bev

Oh, and no she isn't pregnant. They are just fat goats. Yearling doelings. I don't want to milk anymore.  :-)

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Bev
22 minutes ago, piranha said:

 

 

Rice, W.F. 1987

The Systematics and Biostratigraphy of the Brachiopoda of the Decorah Shale at St. Paul, Minnesota.

Minnesota Geological Survey, University of Minnesota, Report of Investigations, 35:136-166  PDF LINK

 

Thanks Piranha! This PDF is a fair amount of Sloan's book. Around page 177 you will find the brach pics. His book is much more readable though.  :-)

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piranha
14 minutes ago, Bev said:

Thanks Piranha! This PDF is a fair amount of Sloan's book. Around page 177 you will find the brach pics. His book is much more readable though.  :-)

 

 

Sloan 2005 is a great resource but it does not have a detailed section on the systematic paleontology of the Decorah brachiopods found in Rice 1987.

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Bev
9 minutes ago, piranha said:

 

 

Sloan 2005 is a great resource but it does not have a detailed section on the systematic paleontology of the Decorah brachiopods found in Rice 1987.

Well, if you go to the PDF you see it is written by Sloan, don't know who Rice is as s/he isn't listed as an author on this. Pics and drawings are in Sloan's book. I agree, not as detailed as this PDF of his, but for basic IDing, good. His book has a ton more pics though. But this is FREE!  And Sloan's book is not.  :-)

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piranha
15 minutes ago, Bev said:

Well, if you go to the PDF you see it is written by Sloan, don't know who Rice is as s/he isn't listed as an author on this. Pics and drawings are in Sloan's book. I agree, not as detailed as this PDF of his, but for basic IDing, good. His book has a ton more pics though. But this is FREE!  And Sloan's book is not.  :-)

 

 

Please check the pdf again, the cited paper is not written by Sloan.  The bulletin was edited by Sloan and he only authored/coauthored 8 out of 26 papers.

 

Rice, W.F. 1987

The Systematics and Biostratigraphy of the Brachiopoda of the Decorah Shale at St. Paul, Minnesota.

Minnesota Geological Survey, University of Minnesota, Report of Investigations, 35:136-166  PDF LINK

image.thumb.png.057643b7f802546ac36f54061f691fe3.png

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Tidgy's Dad

Yes, I already have the papers linked by Scott and they are invaluable. 

Anyway, without a scale in the pictures (ahem;)) it's a bit more tricky, but I think , maybe :

1 : Doleroides pervetus.

2. Pionodema subaequata is possible, but I think Dalmanella sculpta -  how big and can I see the commisure, please? 

3. That's not Zygospira, that's a rhynchonellid,  probably Rostricellula minnesotensis. How many costae? 

4. Is yummy. I think that's Strophomena filitexta? 

5. Seems to be Doleroides pervetus again.

6. Looks pretty small, so maybe Dinorthis pectinella.

7. Diorthelasma? But the dentition looks a bit off.

8. Rostricellula or Rhynchotrema. 

Some beautiful brachs................:wub:

Tony @Peat Burns, any ideas?  

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